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Brazil is an agricultural country, with 190Mha of pastures sustaining 209million cattle. Fewer than 10% of the cattle are fattened in feedlots, whereas cattle reared on pastures have a competitive advantage for export, eliminating the risks presented by the mad cow disease (bovine spongiform encephalopathy) and considerations related to animal welfare. Brazil has been the world's largest exporter of beef since 2004 and has the largest commercial herd in the world. In 2011, 16.5% of its production was exported, and the livestock sector contributed 30.4% of the gross national product from agribusiness and 6.73% of the total GNP. Many forage breeding programs, mainly at Embrapa, have contributed to the development of improved pastures, and cultivars of Brachiaria brizantha, B. decumbens, B. humidicola and Panicum maximum are the main pastures used in the country. All have apomictic reproduction, which means there are few cultivars occupying very large, continuous areas, thus suggesting a risk to the productive system. Such is the case of B. brizantha cv. Marandu, which occupies around 50Mha. The Brazilian tropical forage seed industry is also important, and Brazil is the main seed exporter, supplying all Latin American countries. Due to pasture degradation, around 8Mha is renovated or recovered each year. Forages are also used and planted each year in integrated crop-livestock and integrated crop-livestock-forest systems. Nowadays, these systems occupy 4Mha. Improved pastures are thus a major asset in Brazil not only for the beef production chain but also for the dairy industry.
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The value of improved pastures to Brazilian beef production
Liana Jank
A,B
, Sanzio C. Barrios
A
, Cacilda B. do Valle
A
, Rosangela M. Simeão
A
,
and Geovani F. Alves
A
A
Embrapa Beef Cattle, Embrapa, Rua Radio Maia, 830, 79106-550, Campo Grande, MS, Brazil.
B
Corresponding author. Email: liana.jank@embrapa.br
Abstract. Brazil is an agricultural country, with 190 Mha of pastures sustaining 209 million cattle. Fewer than 10% of the
cattle are fattened in feedlots, whereas cattle reared on pastures have a competitive advantage for export, eliminating the risks
presented by the mad cow disease (bovine spongiform encephalopathy) and considerations related to animal welfare. Brazil
has been the worlds largest exporter of beef since 2004 and has the largest commercial herd in the world. In 2011, 16.5% of its
production was exported, and the livestock sector contributed 30.4% of the gross national product from agribusiness and
6.73% of the total GNP. Many forage breeding programs, mainly at Embrapa, have contributed to the development of
improved pastures, and cultivars of Brachiaria brizantha,B. decumbens,B. humidicola and Panicum maximum are the main
pastures used in the country. All have apomictic reproduction, which means there are few cultivars occupying very large,
continuous areas, thus suggesting a risk to the productive system. Such is the case of B. brizantha cv. Marandu, which
occupies around 50 Mha. The Brazilian tropical forage seed industry is also important, and Brazil is the main seed exporter,
supplying all Latin American countries. Due to pasture degradation, around 8 Mha is renovated or recovered each year.
Forages are also used and planted each year in integrated croplivestock and integrated croplivestockforest systems.
Nowadays, these systems occupy 4 Mha. Improved pastures are thus a major asset in Brazil not only for the beef production
chain but also for the dairy industry.
Additional keywords: forage cultivars, germplasm, selection.
Received 7 September 2013, accepted 13 December 2013, published online 11 March 2014
Introduction
Brazil is essentially an agricultural country with 190 Mha of
pastures, 74 Mha native and 116 Mha cultivated (ANUALPEC
2008). Pasture area equals the sum of agricultural, forest and
wooded areas (IBGE 2010). The vast pasture area and cattle herd
places Brazil as the largest or second-largest producer of beef in
the world, competing only with the United States. In 2012, Brazil
produced 9.4~Mt carcass weight equivalent. Since 2004, the
country has been the worlds largest beef exporter, with
1.69~Mt carcass weight equivalent of beef exported in 2012
(ABIEC 2013). Brazil exports fresh meat to 92 countries, mainly
Russia (27%), Egypt (14%) and Hong Kong (11%); processed
meat to 106 countries, mainly the European Union (49%) and the
United States (16%); and bovine offal and other cuts to 71
countries, mainly Hong Kong (64%) and Angola (4%)
(ABIEC 2013).
Brazils cattle herd is 209 million heads (IBGE 2010), the
largest commercial cattle herd in the world; much of the
production is for the domestic market, and only 18% of
the production was for export in 2012. Most cattle are raised
on pastures, observing animal welfare conditions, and only
10% of the slaughter in 2012 was of animals nished in
feedlots (ABIEC 2013). This confers a differentiation on
Brazilian beef, avoiding risks associated with bovine
spongiform encephalopathy.
The total area of grassland in the country is 190 Mha: 74Mha
native pastures, 99 Mha planted to Brachiaria spp., and 17 Mha
planted to cultivars of other species (ANUALPEC 2008).
Brachiaria spp. represent a large area (85%) of cultivated
pastures in the country; B. brizantha cv. Marandu Palisade
grass, released by Embrapa in 1984, still occupies a large area
(~50 Mha) and is considered the worlds largest monoculture
in terms of area. According to non-ofcial technical surveys, it
is estimated that the country renews and/or recovers ~8 Mha
of pasture every year, ~80% of which is with cultivars of
Brachiaria. In addition, grasses are planted on ~4 Mha for
crop and livestock integrated cattle systems, or crop, livestock
and forest systems (José 2012).
Economic, social and environmental benets
from improved forages
Other competitive advantages of Brazilian beef are the
production costs, which are lower than in other countries,
allowing Brazil to be a major player in the international meat
market. Despite an increase in production costs in recent years,
for beef cattle of both high- and low-input technologies and for
feedlots, mainly due to the high costs of fertilisers, labour
and machinery, etc. (Torres 2012), the beef industry generates
revenues of US$50~billion and employs ~7.5 million Brazilians.
In 2011, the livestock sector contributed with 30.4% of the gross
Journal compilation CSIRO 2014 www.publish.csiro.au/journals/cp
CSIRO PUBLISHING
Crop & Pasture Science
http://dx.doi.org/10.1071/CP13319
national product (GNP) of Brazilian agribusiness and
contributed with 6.73% of the Brazilian GNP (CEPEA 2011).
This highlights the economic and social importance of this sector
for the country.
Brazilian meat, mostly produced on pasture, has been
constantly but incorrectly labelled in the international media as
the primary source of deforestation, among other factors. In fact,
the area occupied by livestock has decreased in recent years
while productivity has increased. According to data from the
agricultural census of 1995 and 2006 (IBGE 2006), Brazil lost
17.6 Mha of pasture. In the same period, the areas of grain (rst
crop) and sugarcane increased 10.5 Mha. In addition, the
annual rate of deforestation in the Legal Amazon is constantly
decreasing. In 2012, 84% less area was deforested than the rate
recorded in 2004, according to a survey by the National Institute
for Space Research (INPE 2012). By contrast, the number of
head of Brazilian cattle grew 22% in the period 200111, a
signicant gain in productivity of Brazilian cattle. In 2001, for
example, productivity was 38.4 kg carcass weight/ha.year,
whereas in 2010 it was 53.9 kg carcass weight/ha.year. These
data clearly demonstrate that it is possible for Brazil to produce
more meat and milk, with less area and more sustainably.
Brazil has signicant natural resources (such as climate, land
and water) to maintain production, and many technologies well
adapted to our production system. However, an essential action
to maintain the sustainability of the livestock sector and increase
productivity gains is investment in the recovery of degraded
pastures. This is a great challenge from now on, since ~47%
of pastures have some degree of deterioration (Nogueira and
Aguiar 2013). Among governmental actions implemented to
encourage the recovery of degraded pastures is the ABC
program (Program for Reducing Emission of Greenhouse
Gases in Agriculture), with the goal to provide funds to
farmers to adopt technologies to protect the soil, increase
productivity and mitigate emissions of greenhouse gases.
Among the goals stipulated in the ABC program is the
recovery of 15 Mha of degraded pastures and establishment of
4 Mha in croplivestockforest systems (CNA 2012).
The Brazilian forage seed market in 2011 had a turnover
of around US$600 million, which is equivalent to 2.5% of the
global seed market and still has potential for expansion (José
2012).
Of the total seed production of the main tropical forages,
Brachiaria ssp. and P. maximum accounted for 83.8% and
13.5%, respectively, of the total seed production area in
201112 (Table 1), and for 99% of the revenue, respectively.
These data demonstrate that much of the industrys revenue
comes from the marketing of seed of these two genera. Other
genera of tropical forages of economic importance (Andropogon,
Arachis,Cajanus,Cynodon,Paspalum,Pennisetum and
Stylosanthes) have a small seed market share. There are no
statistics on the area covered by each pasture species in Brazil.
The only available information is from a survey done by a private
consultancy rm and published in Nogueira (2012), in which
52 000 km
2
of pasture area in Brazil was covered and the pasture
genera recorded. The result was that 68.2% of the pasture area is
covered by cultivars of B. brizantha, 9.1% by other Brachiaria
species (B. decumbens,ruziziensis and humidicola), 10.2% by
P. maximum, 5.8% by Andropogon gayanus, 5.8% by other
species, and 0.8% by native pastures.
Brazil is also the largest exporter of tropical forage seed in the
world, with the main destinations in Latin America (especially
Mexico, Colombia and Venezuela), Africa and Asia. Brachiaria
spp. are the most requested species, representing >80% of the
total volume exported in 2010. Brachiaria brizantha cv. Marandu
and B. decumbens cv. Basilisk accounted for more than half of
Table 1. Seed production area in 20112, mean price of seeds in 2012, and quantity of seeds exported in
2010 of the main tropical forage cultivars
Source: UNIPASTO, pers. comm.
Species Cultivar Area (ha) Price (R$/kg) Export
(kg) (%)
Brachiaria decumbens Basilisk 12 706 18.00 917 575 24.90
Brachiaria ruziziensis Kennedy 7295 13.00 210 0.01
Brachiaria humidicola Common 25 747 85.00 324 184 8.80
Brachiaria humidicola Llanero 5330 45.00 100 224 2.72
Brachiaria brizantha Marandu 55 688 14.00 1 259 128 34.17
Brachiaria brizantha Xaraés 10 697 19.00 413 894 11.23
Brachiaria brizantha BRS Piatã 6385 19.00 50 920 1.38
Brachiaria brizantha MG-4 1820 19.00 ––
Brachiaria brizantha
A
Mulato II 1548 40.00 ––
Panicum maximum Momba¸ca 12 616 30.00 378 512 10.27
Panicum maximum Tanzânia 2912 30.00 216 870 5.88
Panicum maximum Massai 4819 60.00 18 350 0.50
Panicum maximum Aruana 77 50.00 3410 0.09
Andropogon gayanus Planaltina 2294 25.00 0.25
Stylosanthes spp. Campo Grande 1838 9.00 256 0.01
Cajanus cajan Mandarim –– 1290 0.04
Calopogonium mucunoides Common –– 460 0.01
Total 151 772 3 685 283 100.00
A
Interspecic hybrid B. brizantha B. ruziziensis B. decumbens.
BCrop & Pasture Science L. Jank et al.
the volume exported in 2010 (Table 1). Of the released cultivars,
P. maximum cv. Tanzânia and cv. Massai and Cajanus cajan cv.
Mandarim have increased their exports in 2010 compared
with 2009.
In the past, Brazil always imported or introduced new
ecotypes collected in Africa or cultivars developed abroad, in
an attempt to increase carrying capacity of the pastures and
thus ncrease animal productivity. However, the accidental
introduction of Guinea grass Panicum maximum cv. Colonião
via slave-trading in the 19th Century was advantageous to the
Brazilian beef industry, not only because it resulted in greater
animal productivity, but also because it allowed for the rapid
establishment of pastures by seeds and by aeroplane in the north
of the country.
Statistics from 1940 show that ~2.56 ha was necessary for each
head of cattle. Between 1968 and 1972, Brazil imported large
amount of seeds of Brachiaria decumbens cv. Basilisk from
Australia stimulated by government programs to encourage the
formation of pastures. This ecotype was originally from Uganda
and was registered in Australia in 1973 (Oram 1990). Due to its
great adaptability to poor, acid soils, ease of propagation by
seeds, good competitive advantage against weeds, and good
animal performance compared with native grasslands, this
cultivar rapidly covered large expanses of areas in the
Brazilian Cerrados (savannas) and became a monoculture.
This cultivar was the rst crop that was planted in the
Brazilian Cerrados, which then became Brazils grain
warehouse, and it also contributed to a great decrease in area
of pasture needed per head (Fig. 1). However, problems such as
spittlebug susceptibility, photosensitivity especially in weaning
calves, overgrazing and lack of fertilisation led to extensive
areas of degraded pastures.
In 1984, B. brizantha cv. Marandu, an earlier introduction, was
released (Nunes et al.1984). This cultivar was much more
productive than cv. Basilisk and was resistant to spittlebugs. It
gradually replaced B. decumbens, and in turn became the new
monoculture, which continues today, covering ~50 Mha.
In the 1980s, Brazil received its rst apomictic forage
collection, Panicum maximum, which was extensively
collected at its site of origin in Africa (Savidan et al.1989).
Evaluation of this collection led to the release of P. maximum cvv.
Tanzânia and Momba¸ca after 1990, which resulted in great
pasture intensication in the country due to very high
productivity and quality of these cultivars. They were rapidly
adopted by farmers, and the use of this species is widespread
today. All of these cultivars resulted in increased grazing
efciency, and in 2006, only 1.1 ha was necessary per head.
These carrying capacities are mean values for the country,
considering both rainy and dry seasons; under improved
management, considerably higher carrying capacities are
achieved.
The P. maximum collection was introduced to the country as
a result of two expeditions organised by the French Institut de
Recherche pour le Développment (IRD) exclusively for the
collection of this species, which gathered >380 apomictic
accessions and 23 sexual plants. This collection and accessions
received from other research institutions worldwide were
transferred to Embrapa in 1984 in a cooperative agreement.
The second expedition, organised exclusively for the
collection of an apomictic species, was organised by the
International Centre for Tropical Agriculture (CIAT) and
gathered ~800 accessions of 23 species in 198485. Embrapa
later received part of this collection.
Breeding programs
The main breeding programs under way in Brazil are at
Embrapa Centers. However, a few other breeding program
have been developed in Brazil in the universities, mainly at
Rio Grande do Sul State, or Research Institutes as the Instituto
de Zootecnia and Instituto Agronômico de Campinas in São
0.0
1940
1945
1950
1955
1960
1965
1970
1975
1980
1985
1990
1995
2000
2006
0.5
1.0
1.5
2.0
2.5
3.0
Numbe
r of
hectare
s/head
Fig. 1. Number of hectares per head of cattle in Brazil. (Source:
IBGE 2013.)
1
2
7
10
8
3
5
6
9
North
North-East
Mid-West
South-East
South
4
11
Fig. 2. Embrapa Research Centers that hold forage germplasm banks
and/or develop forage breeding programs. 1, Embrapa Acre; 2, Embrapa
Beef Cattle; 3, Embrapa Cerrados; 4, Embrapa Coastal Tablelands; 5,
Embrapa Dairy Cattle; 6, Embrapa Mid-North; 7, Embrapa Pantanal; 8,
Embrapa South Animal Husbandry and Sheep; 9, Embrapa South-east
Livestock; 10, Embrapa Temperate Agriculture; 11, Embrapa Tropical
Semiarid.
Value of improved pastures to Brazilian beef production Crop & Pasture Science C
Paulo State. However, at the Federal University of Rio Grande do
Sul, the focus is breeding cool-season forages; the Instituto de
Zootecnia only evaluates bred cultivars for other institutions; and
Instituto Agronômico de Campinas discontinued its program.
Thus, the main breeding programs are at Embrapa.
Nowadays, CIAT is providing some selected bred cultivars to
undergo animal grazing experiments in Brazil, through a
cooperative agreement with Dow AgroSciences LLC, with the
objective of saturating the Brazilian market with new Brachiaria
hybrids. To date, cv. Mulato II has been released, but the area
sown is still small (Table 1).
Embrapa also holds the main germplasm banks in the country
(Fig. 2). Embrapa Beef Cattle holds the germplasm banks of
Brachiaria spp., P. maximum and Stylosanthes spp. and is
responsible for the breeding programs of three species of
Brachiaria (B. brizantha,B. decumbens and B. humidicola),
P. maximum and Stylosanthes spp. (mainly S. capitata and
S. macrocephala). Embrapa Cerrados is responsible for the
breeding of A. gayanus and S. guianensis. Embrapa Dairy
Cattle holds the germplasm banks of Pennisetum spp. and
Cynodon spp. and is responsible for their breeding and for
breeding of B. ruziziensis. Embrapa Acre holds the germplasm
bank of the forage peanut Arachis spp. (A. pintoi,A. repens and
A. glabrata). Embrapa South-east Livestock holds the germplasm
bank of Paspalum spp. and Cajanus and is responsible for their
breeding. Other germplasm banks within Embrapa are also
available and organised, e.g. buffel grass (Pennisetum ciliare)
germplasm at Embrapa Tropical Semiarid and various regional
banks at Embrapa Pantanal, Embrapa Cerrados, Embrapa Mid-
North and Embrapa Coastal Tablelands. Cool-season forages
have their germplasm bank at Embrapa South Animal Husbandry
& Sheep. This Center also holds the breeding program for lucerne
(alfafa) (Medicago sativa). Embrapa Temperate Agriculture
holds the germplasm of ryegrass (Lolium multiorum), and is
responsible for its breeding.
With research on selection and breeding of forages since the
early 1980s, Embrapa and partners have formed a solid
foundation for the development of new cultivars, which is
crucial for obtaining new genotypes, since all cultivars
currently available have limitations subject to improvement
through breeding (Miles 2007; do Valle et al. 2009).
Cultivar development
The development of tropical forage cultivars is a process
whereby several steps must be fullled in order to reach a
superior genotype, which is a candidate for a new cultivar.
To exemplify this process, we will use as an example the
development of a cultivar of a tetraploid, apomictic forage
grass (Brachiaria and/or P. maximum) (Fig. 3). The process
begins with the availability of the germplasm and its
characterisation for reproductive mode, ploidy level, genetic
diversity, and gene search among others. The apomictic
(tetraploid) accessions are evaluated in small plots, while the
sexual (diploid) accessions must undergo chromosome doubling
so they can be crossed with apomictic genotypes in order to obtain
hybrids. Doubled sexual plants (tetraploid) are then used as
female parents in crosses with apomictic accessions (reciprocal
recurrent selection, RRS, and direct crosses between superior
sexual plants and elite apomictic accessions) or inter-crossed
to improve the sexual population (intra-population recurrent
selection, IRS). In the case of hybrid breeding (RRS),
improvement of the sexual population (IRS), and direct
crosses, populations of up to 2000 hybrids are obtained in
each case and the most vigorous apomictic hybrids move to
the next stage.
In Stage I, the most vigorous accessions from the germplasm
or the best hybrids (100200 genotypes) are evaluated under
a cutting regime in more detail, now considering a larger set
of characters (biotic and abiotic stresses, seed production,
response to nutrients, etc.) not evaluated in the previous stage.
The selected 2025 genotypes follow to the next stage
regional trialsStage II, in which the performance of the
genotypes is evaluated under different harvests in different
locations in order to determine their performance in different
environmental conditions (to identify genotypes with broad
adaptation and/or specic to certain conditions). The
genotypes selected in this stage, i.e. a reduced number of
genotypes (13) are then evaluated in larger experiments under
grazing (Stage III) to determine animal performance (individual
and per area weight gain or milk yield). Once superior
genotypes are identied, they are registered and protected, a
marketing plan is made, and they are later released as cultivars
(Fig. 3).
The stages in Fig. 3take at least 2 years each, and adding
1 year for seed multiplication between each stage, the whole
process takes 810 years. Once the process has begun, there are
always genotypes in various stages of evaluation, which
becomes a production line, with releases in short, medium and
long terms, in response to new limitations in the existing cultivars
(do Valle et al. 2009). Considering the whole process, it is clear
that the focus of the breeding program in the initial stage is to
obtain new genotypes, in the intermediate stage is selection, and
in the nal stage is the recommendation for release of previously
selected superior genotypes. The number of genotypes under
evaluation decreases as the stages continue, from a large number
of genotypes with highly variable performance to a small number
of genotypes with superior performance (elite) for all the traits
under improvement. As the stages progress, there is also an
increase in interdisciplinary collaboration, where several
professionals (entomologists, plant pathologists, specialists in
seed technology, fertility, pasture management, technology
transfer) are inserted in order to reach a common goal, which is
the release of a new cultivar (Fig. 4).
Brachiaria spp. and P. maximum breeding programs,
which have a history of releasing cultivars compared with
other forage genera, are undergoing a paradigm shift. Until
now, the primary method of obtaining new cultivars was the
selection of superior apomictic accessions directly from the
germplasm banks, which is a nite process in terms of
identifying superior genotypes from the pool. Recently,
improvement strategies were adopted in order to obtain
superior hybrids (Fig. 3), thus making the whole system more
efcient and innite.
The development of new forage cultivars now may also
prot from the use of biotechnology to provide accuracy and
agility to support breeding programs, through the identication
of hybrids, the search for molecular markers linked to apomixis,
DCrop & Pasture Science L. Jank et al.
resistance to spittlebugs, tolerance to poor soil drainage,
drought, shading, cold, aluminium toxicity in the soil and
resistance to seed shattering. The genome-wide selection
strategy (Genome Wide Selection) should be adopted in the
medium/long term in order to help cultivar development
programs to be more efcient. More research is necessary for
this to become a reality.
Cultivar releases
Genetic improvement of tropical forages is a very recent activity
compared with the improvement of grain crops such as soybeans
and corn, or temperate forages, for example. Nevertheless,
signicant progress has been achieved in the research and
development of cultivars (do Valle et al. 2009; Jank et al.
2011). Regarding the main forage grasses (Brachiaria spp. and
P. maximum), the efforts of the breeding programs at Embrapa
resulted in the release of B. brizantha cvv. Xaraés (2003), BRS
Piatã (2007) and BRS Paiaguás (2013); B. humidicola cv. BRS
Tupi (2012); and P. maximum cvv. Tanzania (1990), Momba¸ca
(1993), Massai (2000) and BRS Zuri (2014). Releases of
other genera include pigeonpea Cajanus cajan cv. BRS
Mandarim (2009); Paspalum atratum cv. Pojuca (2000);
1 Location
Breeding
1 Location
1 Location/Biome
(VCU cut)
Seed
Multiplication
Seed
Multiplication
Production, seeds, nutritive, biotic (pests,
diseases) and abiotic stresses (Al, flooding),
response to nutrients
Cuttings or
seeds
Superior Sex
hybrids
Superior
Sex hybrids
New cultivar Release & Adoption
1 Location/Biome
(VCU grazing
Registry & Protection
Marketing Plan)
Fig. 3. General breeding scheme of the stages and number of genotypes involved in the development of
a cultivar of tropical forage grass (tetraploid apomictic). (Diagram by Sanzio Carvalho Lima Barrios.)
Breeding
Stage I
Creation
Elite
Few
Several
Diverse
Less More
Interdisciplinarity
Objectives of the breeding program
Genotypes
Number of genotypes
Selection Recommendation
Stage III
Regional
trials
Fig. 4. Integrated graph of the elements (components) involved in the
stages of development of tropical forages. (Diagram by Sanzio Carvalho
Lima Barrios.)
Value of improved pastures to Brazilian beef production Crop & Pasture Science E
cultivars of vegetatively propagated Pennisetum spp.cvv.
Pioneiro (1996), BRS Canará (2012) and dwarf BRS Kurumi
(2012); and Stylosanthes cv. BRS Campo Grande (2000). Forage
peanut Arachis pintoi cv. BRS Mandobi was registered in 2008,
protected in 2011, and it is expected to be released in 2014. Cool-
season grasses released by Embrapa are Sorghum sudanense BRS
Estribeiro (2013) and ryegrass BRS Ponteio (2010). CIAT
released B. brizantha cv. Mulato II in 2005, but its area of use
is still small.
Embrapa varieties have a signicant participation in the
domestic market of tropical pasture seed (market share); the
share was 78% in 201112 and it is certain to continue as
the programs have matured and activities in the several
programs have intensied.
The social balance of Embrapa, carried out every year to
evaluate the impact of the technologies developed on the
performance of the agricultural sector, showed that in 2012
B. brizantha cvv. Marandu and BRS Piatã, P. maximum cvv.
Tanzania and Momba¸ca, and Stylosanthes cv. Campo Grande
contributed with >64% of the economic impact (increased
productivity) of the entire Embrapa program (Embrapa 2013).
Projections for the future
In the near future, world population is expected to increase
signicantly. It is estimated that by 2050 the world will have 9
billion people. With this scenario, a signicant increase in the
production of protein (meat and milk) will be needed. Brazil has
the largest commercial cattle herd in the world and numerous
opportunities to increase productivity and hence protability
without opening new areas to cultivated pasture. According to
projections of agribusiness, described in Outlook Brazil 2022
(FIESP/ICONE 2012), exports of beef, which accounted for
16.5% of the Brazilian production in 2011, will increase to 23%
in 2022, being an important inuence on growth in this sector.
In fact, beef export in 2012 already increased to 18% (ABIEC
2013). Increases in productivity and greater production
efciency should increase animal production without
requiring a signicant increase in the number of head or
pasture area. To meet the projected demand and maintain the
growth, the Brazilian cattle herd should increase to 227 million
head by 2022, signifying a growth rate of 0.4% per year
between 2012 and 2022. If the same stocking rate as in 2010
were to be maintained, 197.8 Mha of pasture would be required.
However, the projection for pasture area in 2022 is of
176.3 Mha. It should be possible to produce more meat and
milk while reducing the area required by 21.4 Mha, through
production intensication with better forages, better
management and integrated croplivestockforage systems.
The use of more productive and better quality pastures
implies more efcient breeding methodologies and tools,
dynamic breeding programs and efcient technology transfer
resulting in progressively better meat and milk production from
pastures.
Acknowledgements
The authors acknowledge the Association for the Promotion of Research in
Forage Breeding (Unipasto) for kindly providing the technical information on
the seed industry in Brazil.
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www.publish.csiro.au/journals/cp
... In Brazil, pastures occupy 156 million hectares across six previously defined biomes (Projeto MapBiomas, 2021). These pastures support a national herd of ~224 million cattle (IBGE, 2019) and places Brazil as the world's second-largest beef producer, after the United States (Jank et al., 2014). Pastoral farming systems in Brazil are heavily reliant on native forage species for productive stability and conservation of natural resources. ...
... The significant time and resource requirements involved in obtaining consistent data within breeding programs, considering the extensive number of genotypes and characters studied (Jank et al., 2014), requires the determination of the minimum number of measurements for the selection of superior genotypes (Rodrigues et al., 2020). This is a major issue faced by forage breeding programs, which need to determine the number of measurements necessary to accurately estimate the differences between genotypes (Toebe et al., 2020). ...
... The high number of genotypes and characters studied within breeding programs (Jank et al., 2014), requires significant time and resources to obtain consistent data and needs an estimate of the minimum number of measurements for selection of superior genotypes (Rodrigues et al., 2020). Therefore, several studies have been conducted to estimate the repeatability (ρ̂) of characteristics of interest in forage plants including Urochloa spp. ...
Article
Full-text available
The objective of this study was to verify the repeatability of the expression of forage characters in intraspecific hybrids of Paspalum notatum Flügge to aid early selection. Across five harvests, plant height, tiller population density, leaf dry matter, stem dry matter, inflorescence dry matter, total dry matter, and growth habit were quantified for five parents, 189 hybrids, and a commercially available cultivar as a control (n = 195). Analysis of variance, principal components analysis, and structural analysis methods were used to determine the repeatability coefficients. The repeatability coefficients (ρ̂) for all evaluated characteristics generated by the different methods were between 0.05 (ANOVA II) and 0.95 (PCACov). For most of the characteristics studied, repeatability coefficients and determination coefficients were considered high. The repeatability coefficients estimates obtained for the eight characteristics evaluated with the ANOVA I and II methods were almost always lower than those obtained by PCA and structural analysis methods. Based on the covariance matrix, the principal component method generated higher estimates than those produced by ANOVA or structural analysis. Assuming a minimum 80% reliability to verify the relative superiority of the hybrids across all assessed traits, the five harvests proved adequate for selecting the optimal plant materials to advance to the next phase of the breeding program. However, reliable early selection for leaf dry matter, leaf:stem ratio, and total dry matter required a minimum of two harvests. The genetic parameters (h 2 and CVg) showed a favorable scenario for direct selection to increase forage production.
... Species of the Urochloa genus play an important role in Brazil's economy, occupying extensive pasture areas and accounting for more than 80% of cultivated areas (Jank et al. 2014). These grasses have desirable characteristics, such as high productivity, adaptation to acidic and low-fertility soils, and resistance to spittlebugs (Valle et al. 2010;Simeão et al. 2023). ...
Article
Full-text available
The objective of this study was to mor-pho-agronomically characterize Urochloa sp. accessions from the forage collection of Embrapa Capri-nos e Ovinos, aiming to identify the most divergent accessions to support the selection of materials better adapted to cultivation under semi-arid conditions. Fifteen Urochloa sp. accessions were used in a randomized block design with three replications and eight plants per plot, with a spacing of 0.5 m between plants and 0.5 m between rows. A uniformi-zation cut (60 days after transplantation) was performed , followed by two subsequent cuts at intervals of 60 days, starting from the uniformization cut. The morphological characterization was initiated 12 days after the uniformization cut. The characterization of the accessions was performed based on 24 quantitative and qualitative morpho-agronomic descriptors of Brachiaria. The evaluations of fresh and dry matter productivity were performed following the two subsequent cuts after the uniformization cut. After completing these evaluations, a water deficit tolerance assessment was also conducted. The quantitative descriptors were subjected to analysis of variance , considering the two cuts. The obtained data were analyzed, and ten groups were formed, with the accessions UmCO-11 (2) and UmCO-2 (2) showing the highest genetic divergence. In conclusion, high variability was observed among the evaluated Uroch-loa accessions, which may indicate their potential for incorporation into breeding programs. The identification of genotypes tolerant to water deficit stress is of great value for ensuring productivity and the peren-niality of pasture.
... In Brazil, pastures occupy approximately 21% of its territory, with the Urochloa genus standing out, with the marandu cultivar (Urochloa brizantha) currently being the most cultivated forage crop in the country (Lapig, 2020). Marandu grass is a forage grass of significant economic importance because of its remarkable adaptability to different soil and climate conditions, favoured its spread and application in animal production systems in the tropics (Jank et al., 2014). However, optimising the sustainable production of marandu grass requires a deep understanding of the complex interactions resulting from the management practises often employed in pastoral environments. ...
... Similar to our study, Qudoos et al. (2023) found significant variation in the concentration of trace elements in the collected forages. According to Jank et al. (2014), the mineral contents of forages are influenced by the soil type, age and species of plant, use of fertilizer and season. In a column, the mean sharing similar letters is not statistically significant (P > 0.05). ...
Article
Full-text available
This study was designed to evaluate the trace elements (minerals) in forages fed to sheep and their effect on gastrointestinal parasite burdens. The ultimate objective was to determine the correlation between the burden of gastrointestinal (GI) parasites and the level of trace minerals in sheep serum as a result of the forages they grazed on. A total of 384 faecal samples were collected from sheep in each of the districts (Sialkot and Multan) and examined quantitatively using the McMaster technique. Serum collected from them and plants were pre-treated, and spectrophotometry was used to determine the concentration of trace minerals (Mn, Co, Cu, and Zn). The level of these trace elements differed significantly (P < 0.05) in forages from both districts. In the district of Sialkot, the highest concentrations (mg/Kg) of Zn (38.53 ± 0.16) were found in Cichorium intybus, Cu (41.57 ± 0.07) in Cynodon dactylon, Mn (39.61 ± 0.05) in Parthenium hysterophorus, and Co (1.42 ± 0.03) in Coronopus didymus. In the district of Multan, the highest concentrations (mg/Kg) of Zn (39.43 ± 0.46) were found in Cichorium intybus, Cu (25.76 ± 0.36) in Cynodon dactylon, Mn (34.29 ± 0.53) in Launaea nudicaulis, and Co (1.74 ± 0.08) in Brachiaria raptens. The prevalence of GI parasites in sheep populations in district Sialkot was 34%, while in district Multan, it was 32%. In tehsil Sialkot of district Sialkot, Zn and Cu were significantly (P < 0.05) correlated with eggs per gram (EPG) of faeces, while in tehsil Multan City of district Multan, only Cu was significantly (P < 0.05) correlated with EPG. The potential mechanism behind the role of trace minerals in lowering the burdens of GI parasites requires more investigation. It is recommended that plants with high content of trace minerals should be utilized as part of comprehensive preventive and control strategies against GI parasitism in ruminant animals like sheep.
... Griseb.) achieved great economic importance in the tropical world due to the broad adaptation of several ecotypes to acidic soils with low fertility and their satisfactory performance as pasture for cattle (Jank et al, 2014). Due to its importance to Brazil, Embrapa Beef Cattle started the breeding program of the genus in the 1980s. ...
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Intra- and interspecific hybridization in the genus Urochloa is complex due to apomixis and polyploidy. Such barriers can be overcome by crossing apomictic tetraploid plants as pollen donors with artificial tetraploid sexual plants as female parents. Another barrier is the incompatibility between the genomes of the different species used in hybridization. Since the meiotic behavior is a good indication of affinity between genomes in a hybrid, the present study analyzed the meiotic behavior of a sexual polyploid interspecific hybrid of Urochloa from the breeding program at Embrapa Beef Cattle. In addition to the segregational abnormalities associated with polyploidy, cytological studies revealed that, after diakinesis, chromosomes presented an abnormal arrangement in the metaphase plate. In 31.33% of meiocytes, chromosomes were organized into more than one plate, forming up to four metaphase plates. Another abnormality observed in 5.72% of the cells was the lack of convergence of chromosomes to the equatorial plate and consequent abnormal anaphase segregation. These abnormalities led to the formation of several nuclei within the same myocyte then separated by an irregular cytokinesis pattern, forming tetrads with micronuclei, microcytes and polyads. This pattern of behavior seriously compromises the formation of viable gametes, which may later affect the generation of fertile hybrids thus impairing the use of this hybrid as a female parent.
... Com base nisso, percebe-se a importância da definição de referências de níveis nutricionais para vacas de corte adultas. Com base nos atuais índices médios de produtividade de rebanhos de corte no Brasil (Baruselli et al., 2012;ABIEC, 2013;Jank et al., 2014;Chiavegato et al., 2015) estima-se que há um potencial de melhoria de 30 a 40% da eficiência de produção de bezerros de corte (Gionbelli et al., 2015c), considerando melhorias conjuntas em nutrição, reprodução e genética. ...
... We therefore needed to define references for nutritional levels for adult beef cows. Based on the current mean productive indexes of beef cattle herds in Brazil (Baruselli et al., 2012;ABIEC, 2013;Jank et al., 2014;Chiavegato et al., 2015), it is estimated that there is potential for 30-40% improvement in the production efficiency of beef calves (Gionbelli et al., 2015c), considering joint improvements in nutrition, reproduction and genetics. ...
... Com base nisso, percebe-se a importância da definição de referências de níveis nutricionais para vacas de corte adultas. Com base nos atuais índices médios de produtividade de rebanhos de corte no Brasil (Baruselli et al., 2012;ABIEC, 2013;Jank et al., 2014;Chiavegato et al., 2015) estima-se que há um potencial de melhoria de 30 a 40% da eficiência de produção de bezerros de corte (Gionbelli et al., 2015c), considerando melhorias conjuntas em nutrição, reprodução e genética. ...
... We therefore needed to define references for nutritional levels for adult beef cows. Based on the current mean productive indexes of beef cattle herds in Brazil (Baruselli et al., 2012;ABIEC, 2013;Jank et al., 2014;Chiavegato et al., 2015), it is estimated that there is potential for 30-40% improvement in the production efficiency of beef calves (Gionbelli et al., 2015c), considering joint improvements in nutrition, reproduction and genetics. ...
Article
Urochloa spp. are excellent perennial forages and are among the best grasses for livestock production. The seed yield is an important trait because it impacts the seed production cost and, consequently, the cost of establishing pastures. The objective of this study was to estimate the genetic correlation between traits related to seed production in Urochloa spp. The experiment was evaluated in 2019 and 2020. Eight traits related with seed production were evaluated for 23 tetraploid progenies obtained by crossing Urochloa brizantha × Urochloa ruziziensis . There were positive correlations of high magnitude between the characters, allowing indirect selection. Two progenies showed better results in traits directly related to seed production. Days to flowering can influence the rate of seed production. The highest value for grain percentage was 20.31%.
Article
Full-text available
Brazil has the largest commercial beef cattle herd and is the main beef exporter in the world. Cultivated pastures are the basis for the Brazilian beef production, and occupy an area of 101.4 million hectares. However, very few forage cultivars are commercially available, and the majority of these are of apomictic reproduction, thus genetically homogeneous. Tropical forage breeding is at its infancy, but much investment and efforts have been applied in the last three decades and some new cultivars have been released. In this paper, origin of different species, modes of reproduction, breeding programs and targets are discussed and the resulting new cultivars released are presented.
Article
Full-text available
Apomixis is widely distributed among tropical forage grasses, and has long been merely regarded as an impediment to breeding. Panicum maximum is presented as the first opportunity for Brazilian geneticists to develop and test original breeding schemes adapted to an apomictic species. A large and representative germplasm of P. maximum has been introduced and is currently being evaluated. Basic knowledges on biology and reproduction are also available, which demonstrate an easy manipulation of apomixis and sexuality. Several limiting traits have already been detected during evaluation, which justify breeding attempts. An ideal scheme is given to transfer new qualities to already selected varieties.
Article
Apomixis - asexual reproduction through seed - provides a convenient means to faithfully propagate even heterozygous genotypes and hence exploit heterosis, in several naturally apomictic, warm-season forage grasses. Inheritance of apomixis has been shown to be monogenic dominant in at least four economically important panacoid grasses. Previously proposed breeding schemes for apomicts do not provide a means to accumulate genes contributing to nonadditive, heterotic effects over cycles of selection and recombination. Following the development of successful brachiariagrass [Brachiaria (Trin.) Griseb] cultivars by ecotype selection, artificial hybridization of brachiariagrasses began in the late 1980s with the development of a sexual tetraploidized biotype of the natural diploid, sexual ruzigrass (Brachiaria ruziziensis Germain and Evrard). A breeding scheme - recurrent selection for specific combining ability - designed to accumulate nonadditive effects, originally proposed for sexual maize (Zea mays L.), is suggested as an appropriate scheme for improvement of apomictic tropical grasses. Recurrent selection on specific combining ability or interpopulation selection schemes such as reciprocal recurrent selection should be appropriate for other asexually propagated crops.
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