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Production and reproduction characteristics of South African indigenous goats in communal farming systems

Authors:
  • Tarleton State University Texas A&M University System

Abstract

South African indigenous does in rural communal farming systems kid for the first time at approximately 17 to 18 months of age. Does conceive at a relatively low body condition score (BCS ≈ 2.5 to 3) and their average litter size is 1.7 kids per doe. The average kidding interval was approximately 238 days and the highest kidding rates were attained in autumn (96%), followed by spring (93%), winter (63%) and summer (0%). The mortality rates in goats in communal systems were extremely high (40.6%) compared to systems with better management (
South African Journal of Animal Science 2004, 34 (Supplement 1)
©South African Society for Animal Science
Peer-reviewed paper: 8
th
International Conference on Goats
236
Production and reproduction characteristics of South African indigenous goats
in communal farming systems
E.C. Webb
#
and M.J. Mamabolo
Department of Animal & Wildlife Sciences, Faculty of Natural & Agricultural Sciences, University of Pretoria,
Pretoria 0002, South Africa
_______________________________________________________________________________________
Abstract
South African indigenous does in rural communal farming systems kid for the first time at
approximately 17 to 18 months of age. Does conceive at a relatively low body condition score (BCS 2.5 to
3) and their average litter size is 1.7 kids per doe. The average kidding interval was approximately 238 days
and the highest kidding rates were attained in autumn (96%), followed by spring (93%), winter (63%) and
summer (0%). The mortality rates in goats in communal systems were extremely high (40.6%) compared to
systems with better management (<5%). The mortality rates result from theft, poor hygiene and predation.
Breeding is not controlled and occurs all year round, which creates managerial problems.
_______________________________________________________________________________________
Keywords: Indigenous goats, communal farming systems, productivity
#
Corresponding author. E-mail: edward.webb@up.ac.za
Introduction
Livestock production is the most important agricultural activity in most of the countries in southern
Africa. The breeding strategies followed in southern Africa generally depend on the environment and level
of management. As far as the environment is concerned, livestock production is often practiced under
unstable and hazardous production conditions, and further threatened by bush encroachment or
desertification. Producers vary from sophisticated commercial to communal subsistence producers (Braker et
al., 2002).
The role of goats in the traditional areas has been recognised (Devendra & Burns, 1970; Devendra &
McLeroy, 1980; Wilson, 1988; 1989). Goats, like cattle, play an important role in the livelihood of rural
people in communal farming systems. Indigenous goats are more common in the communal areas, while
Boer goats are mostly found on commercially owned farms. Indigenous goats constitute a valuable genetic
resource because of their ability to adapt to harsh climatic conditions, to better utilize the limited and often
poor quality feed resources and their natural resistance to a range of diseases such as pulpy kidney, gall
sickness and internal parasites. Goats thus play an important socio–economic role in rural areas, which
includes some of the most resource poor farmers in Africa. These animals are prolific and require low inputs
for a moderate level of production, reach maturity early and are profitable to keep (Devendra & Burns,
1970).
Although there is now a considerable body of published research on indigenous types of small
ruminants in tropical areas of Africa, much of the work published has the disadvantage of having been
carried out under controlled conditions at research stations. Consequently, results are often not applicable to
communal production systems in rural areas. The aim of this research was to study the fertility status and
performance of goats indigenous to South Africa in communal production systems in order to recommend
strategies for improved production.
Materials and Methods
This study was conducted in the Moutsi district of Mpumalanga, 25°27` S and 30°58` E. This is a rural
area and the agricultural pressure on the land is very high. Small ruminants are enclosed and tethered in a
wooden hut during the night and are only allowed to graze and browse during the day under the supervision
of a herdsman, particularly young men or women. The seasonal characteristics of the area are summer
(October – January), winter (May – July), autumn (February – April) and spring (August – September).
Forty goat farmers were randomly selected from seven villages and farms with between 4 to 156 goats were
monitored (297 goats in total) from February 1997 to November 1997. Each herd was visited monthly and
The South African Journal of Animal Science is available online at http://www.sasas.co.za/sajas.html
South African Journal of Animal Science 2004, 34 (Supplement 1)
©South African Society for Animal Science
Peer-reviewed paper: 8
th
International Conference on Goats
237
the reproductive characteristics, growth performance and mortality rates were recorded. At the onset of the
study all animals were weighed and aged by dentition. Growth performance and estimates of age at first
kidding were only recorded for animals with a known birth date. Weaning was assumed to occur at 150 days
(Devendra & McLeroy, 1980; Wilson, 1983). The effects of season and production system on production and
reproduction data were analysed using the Proc GLM procedure of SAS (SAS, 1991).
Results and Discussion
Prestige and status were terms used in a derogatory manner to describe the behaviour of traditional
ownership in relation to their animals. The reasons for keeping livestock are rational and are related to their
particular needs in the long or short term. This is supported by the age and sex structure of the flocks. In rural
areas, goats are generally more important than sheep for sacrificial purposes. Nevertheless, goats and sheep
do not arouse the same emotions as cattle in rural people (Hunter, 1936). Despite the major objectives of
keeping goats, there is always a predominance of does in the flock, while minor differences in sex and age
structure are maintained. All animals in the flock are productive, whether production consist of giving birth
to young, producing milk or simply the process of growth to a size at which another product becomes the
principal one.
The major management practice used to obtain stability of structure is the selling or slaughtering of
bucks not required for other production functions, for home consumption and/or performance of rituals.
Usually one or two bucks are retained in the flock for reproduction. Animal production systems in
Mpumalanga are traditional and the households are generally dependent on livestock production for an
income or food supply and crop production is often associated with livestock production. Daily movement of
livestock from home to the grazing fields is recognised as an important aspect of management within the
system. The enclosing of livestock in huts or kraals is done mainly to protect them from theft and predation.
In many African countries culture dictates that women are subordinates to men and hence are socially
marginalized (Braker et al., 2002). Women own goats but they are often not allowed to sell goats in the
absence of their husbands, who generally work as migrant labourers. The various decision-making levels
related to goat ownership in Mpumalanga depict a conspicuous gender imbalance, which is a product of
strong cultural background biased against women. Nevertheless, goats are generally more prolific and easier
to manage than sheep for people with little animal experience. Goats forage more widely and on a greater
variety of foods, they survive the seasonal droughts due to their ability to browse and are quite prolific under
these extensive conditions. Although not reflected by official statistics, it is probable that the number of
goats kept by the rural people has increased markedly in the last few years. The ownership of goats bestows
prestige and they have a place in local custom and religion.
The annual reproductive rate is a composite parameter that does not appear to be utilised as much as it
should be (Wilson, 1989). The total number of young per breeding female per year has been calculated as
the size of the litter and the number of days in a year divided by the kidding interval, i.e. litter size x 365 /
kidding interval. The annual reproductive rate of indigenous does increases with age and peaks at 3 to 4
years of age, remains stable and then starts to decrease (Table 1).
Goats are the most prolific of all domesticated ruminants under tropical and subtropical conditions and
certain goats are able to breed throughout the year (Hofmeyr et al., 1965; Devendra & Burns, 1970; Casey &
Van Niekerk, 1988; Greyling, 1988). Indigenous goats in Mpumalanga breed throughout the year with the
highest kidding rate recorded in autumn, which indicates a summer breeding season that coincides with
optimum feed availability. The length of the breeding season is primarily the result of genetic and
environmental interactions (Casey & Van Niekerk, 1988) with the environment playing a major role.
Tropical goats reportedly exhibit poly-oestrous all year round, but it is known that environmental factors
other than photoperiod, e.g., availability of feed and variations in rainfall, temperature and humidity, may
affect the breeding season of goats (Amoah et al., 1996).
The gestation length for indigenous goats in Mpumalanga varied between 145 to 148 days, which
agrees with that reported for Boer goat does (Greyling, 1988). A gestation period of 149 days is normal in
does (Shelton, 1978), with variations between 144 and 151 days. It was not possible to quantify the effect of
the weight of the kids, type of birth (single or twins) or type of diet on the gestation length in the present
study.
Similar to Boer goat does (Casey & Van Niekerk, 1988; Greyling, 1988), the indigenous goats in
Mpumalanga are early breeders, reaching puberty at 6 to 7 months of age. The age at first kidding varied
The South African Journal of Animal Science is available online at http://www.sasas.co.za/sajas.html
South African Journal of Animal Science 2004, 34 (Supplement 1)
©South African Society for Animal Science
Peer-reviewed paper: 8
th
International Conference on Goats
238
between 16 to 18 months of age, which is similar to West African Dwarf goats in Chad, but longer than the
Togo (15 months), Sahel (13 months) and Maradi goats (14 months) (Wilson et al., 1989) and West African
Dwarf goats in Nigeria (Ikwaegbu et al., 1995). Age at first kidding of South African indigenous goats is
shorter than that reported for Rwandan goats (21 Months, Wilson et al., 1989). Average litter size was 1.7,
and 76% of the births that occurred in autumn and spring were twins, while only 24% of the births in winter
were twins (Table 1).
Table 1 Effect of season and age on the prolificacy of indigenous South African goats (n = 297)
Season
Single birth
Twin birth
Proportion of total
Autumn
Winter
Spring
Summer
4%
68%
7%
0%
96%
32%
93%
0%
54%
24%
22%
0%
Age ( years ) Prolificacy
2.5
3.5
4.5
5.5
56.1 - 77.3%
7.3 - 98.2%
133.4 - 183.7%
106.2 - 146.3%
The average kidding interval of indigenous goats in Mpumalanga was 258 days (n = 297), which is
slightly shorter than that of West African Dwarf goats or goats from other parts of Africa (Wilson, 1989;
Odubute et al., 1992). Ikwuegbu et al. (1995) also reported a kidding interval of 250 days for West African
Dwarf goats in Southern Nigeria. Apparently these shorter kidding intervals are more common in traditional
systems where uncontrolled breeding is practiced. Does in Mpumalanga often kid three times in two years
which agrees with the findings of Mack (1983). The-kidding pattern of indigenous goats also suggests that
they are most prolific at about four years of age (Table 1).
Mortality rates of goats in Mpumalanga ranged between 3.8 and 40.1%. Similar mortality rates were
reported for goats in other parts of Africa (Devendra & Burns, 1970; Bembridge, 1989; Wilson, 1989;
Ikwuegbu et al., 1995; Manjeli et al., 1996). Unlike the West African Dwarf goats where stillbirths or
abortions constituted the major cause of mortalities, mortalities of indigenous goats were mainly due to theft,
predation and coccidiosis due to poor hygiene. These causes of mortality can be controlled if proper
management practices are implemented.
It appears that the potential productivity of goats is constrained by a poor understanding of the value
of goats and of strategies for improved natural resource management in target environments. False
perceptions about environmental degradation, biases, inadequate official support and resources are probably
the major constraints that detract from sustainable goat production. Until recently, in southern Africa there
has been an official bias against the goat as destroyer of vegetation. Because of this prejudice, efforts to
exploit the full potential of this animal have been generally minimal, compared to efforts in sheep and cattle
(Bembridge, 1988).
Indigenous goats have a considerable potential provided that proper management is employed and that
their potential in terms of valuable and productive small stock is recognised.
Conclusion
The current reproduction status of communal goat does is low, mainly due to high kid mortalities and
inbreeding. In traditional livestock management, does and bucks run together all year round. Usually one or
two bucks are left in the herd for up to five years resulting in inbreeding. The genetic resource of indigenous
goats is therefore at risk if no effort is made to improve the management of goats in communal farming
systems. Research and development efforts can significantly improve production from goats and
simultaneously enhance the livelihood of the poor. In the search for efficiency and the maximum use of
The South African Journal of Animal Science is available online at http://www.sasas.co.za/sajas.html
South African Journal of Animal Science 2004, 34 (Supplement 1)
©South African Society for Animal Science
Peer-reviewed paper: 8
th
International Conference on Goats
239
available animal genetic resources, more enlightened thinking is necessary about the role that the goat can
play.
Acknowledgements
The authors wish to thank the National Research Foundation (NRF) for their financial support and
STATOMET at the University of Pretoria for the statistical analysis of the data.
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Data on indigenous strains of African goats and sheep from Rwanda and Mozambique are presented. Age at first parturition (least-squares means) was 640 days in Rwanda goats, 693 days in Mozambique goats, 713 days in Rwanda sheep and 767 days in Mozambique sheep. Parturition intervals were 343 days (Rwanda goats), 408 days (Mozambique goats), 406 days (Rwanda sheep) and 373 days (Mozambique sheep). Litter sizes were 1.75 and 1.49 in goats and 1.43 and 1.40 in sheep in Rwanda and Mozambique, respectively. Repeatabilities of litter size ranged from 0.03 to 0.19, the higher of these being at the upper end of the range of values reported elsewhere. Management of the reproductive process could reduce both age at first parturition and intervals between births. This would enable faster rates of genetic gain for litter size. Both species in both countries could be used to improve reproductive performance of other types of African small ruminants.
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This paper outlines the importance of goats and sheep in the tropical part of Africa using three criteria: density per unit area, numbers of goats and sheep per person, and contribution of goats and sheep to ruminant biomass. The main goat and sheep types are briefly described. Traditional and modern production systems are discussed in relation to ecological zones, management practices ownership patterns and flock structures. Major constraints are identified and increased research efforts in relation to their importance should lead to significant improvements in economic output.
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Empirical data for a series of reproductive traits from a range of sources (National Agricultural Research Systems and individual studies) in different agro-ecological zones and under several systems of management are presented and discussed. Goats and sheep give birth for the first time at about 17 months. Litter sizes of goats average 1.38 kids and litter sizes of sheep 1.16 lambs. Intervals between births are about 10 months. Total lifetime production of young is better in goats than in sheep. African small ruminants have the capacity to breed all the year round. Better performance is achieved in traditional systems where breeding is uncontrolled than on research stations, although litter sizes generally appear to be larger on stations than in the traditional systems. Better management of the reproductive process could lead to greatly improved output of young.
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Boer goats evolved in Southern Africa from indigenous African and introduced European stock. Breed standards of the Boer Goat Breeder's Association stipulate color to be white with red head and blaze, pigmented skin and good, functional conformation. Boer goats are hardy, graze a wide spectrum of plants, grasses and shrubs, effectively combating bush encroachment, have low water turnover rates and low internal parasite infestation. Does are early breeders, polyoestrous and may be synchronized with intravaginal progestogen or PMSG. A 70% kidding rate is reported with AI. Anaplasma ovis infection of does, transmitted transplacentally to the fetus causes abortions and neo-natal mortalities. Milk yield averages 1.5 to 2.5 kg/day with 43 g/kg protein and 77 g/kg fat contents. Libido and semen quality of bucks varies seasonally. Performance testing aims to measure dam's characteristics pre- and post-weaning, feed efficiency of kids under standardized conditions, and qualitative and quantitative carcass evaluation of sire's progeny. The future of Boer goats lies in performance testing for economically important traits.