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To cite this paper: Saeed M, Ahmad F, Asif Arain M, Abd El-Hack M-E, Emam M and Ahmed Bhutto Z (2017). Use of Mannan- Oligosaccharides (MOS) As a Feed Additive in
Poultry Nutrition. J. World Poult. Res., 7 (3): 94-103. 94
JWPR
Journal of World’s
Poultry Research
2017, Scienceline Publication
J. World Poult. Res. 7(3): 94-103, Sept 25, 2017
Review, PII: S2322455X1700012-7
License: CC BY 4.0
Use of Mannan- Oligosaccharides (MOS) As a Feed Additive in
Poultry Nutrition
Muhammad Saeed1*, Fawwad Ahmad2, Muhammad Asif Arain1,3*, Mohamed E. Abd El-Hack4, Mohamed Emam5, Zohaib
Ahmed Bhutto3 and Arman Moshaveri6
1Department of Animal Nutrition, College of Animal Sciences and Technology, Northwest A&F University, Yangling 712100, China
2Department of Poultry Science, Institute of Animal and Dairy Sciences, University of Agriculture, Faisalabad, Pakistan
3Faculty of Veterinary and Animal Sciences, Lasbela University of Agriculture, Water and Marine Sciences, 3800, Uthal, Balochistan, Pakistan
4Department of Poultry, Faculty of Agriculture, Zagazig University, 44511, Zagazig, Egypt
5Department of Nutrition and Clinical Nutrition, Faculty of Veterinary Medicine, Damanhour University, Damanhour, Egypt
6Department of Veterinary Medicine, Karaj Branch, Islamic Azad University, Karaj, Iran
*muhammad.saeed@nwafu.edu.cn Received: 09 Jul 2017
Accepted: 14 Aug 2017
ABSTRACT
The European Union banned using all prophylactic antibiotics as growth promoters in poultry nutrition. As a result,
the poultry nutritionist is now forced to look for growth promoting antibiotic alternatives, or at least considerably
demote the amount of antibiotics used to sustain efficient broiler meat production and to be able to produce safe
poultry egg and meat products. The Mannan-oligosaccharides (MOS), is a type of probiotics originated from the
yeast cell wall (Saccharomyces cerevisiae) has gained more prominent attention, mainly due to its ability to bind the
threadlike fimbriae on pathogenic bacteria preventing them from attaching to the gut wall, thereby averting their
stabilization and the resulting colonization and multiplication, up to the disease level, so it had been showed to be a
most capable solution for antibiotic-free diets, as well as furnishing effective support for digestion and immunity in
poultry. Several investigations confirmed that using MOS as a feed supplement in poultry diets allowed birds to
achieve a similar trend as when they were fed a diet enriched with antibiotic growth promoters. In addition, MOS has
also shown to have a positive affection on bodyweight gain, feed conversion ratio, egg weight, egg production,
fertility, and hatchability thus ameliorating well-being, energy levels and performance of avian species. Furthermore,
it is also thought that it plays a role as an antioxidant, helping with mineral retention, improving bone mineralization
and subsequently the overall improvement the performance of poultry birds. This review article has aimed to
illuminate its sources, mode of action and beneficial applications of MOS in poultry diet for improving, production,
immunity, safeguarding health among consumers and it ought to be used as a natural growth promoter on a
commercial level in order to replace synthetic antibiotics in the poultry industry.
Key words: Antioxidant, Feed additive, Gastrointestinal health, Mannan-oligosaccharides (MOS), Performance,
Poultry
INTRODUCTION
In the past decades, a variety of feed accretive had
been employed in poultry diet. These feed accretive led to
an improved rendition and effective utilization of feed in
poultry birds (Chand et al., 2016a; Shah et al., 2016; Xing
et al., 2017; Saeed et al., 2017a,b). Routinely being
utilized in accretive of feed as: emulsifiers, antimicrobials,
antioxidants, biological products, herbs, pH control agents
binders and enzymes as well (Vahdatpour and Babazadeh,
2016; Siyal et al., 2017; Tareen et al., 2017; Saeed et al.,
2017 c,d,e).
Growth promoting is not the only use of feed
additives but they have used also for stabilizing the
95
beneficial gut microflora by forestalling beneficial
microorganisms (Hashemi and Dawoodi, 2011; Abudabos
et al., 2017). In the last few decades, antibiotics that are
used as growth promoters in animal feed have been under
severe attention, since they pose apotential threat to
consumers by generating resistance in the host against the
bacteria (Sultan et al., 2015). Conclusively, the European
Union had banned the supplementation of growth
promoting antibiotics in the animal diet since 2006 (Khan
et al., 2016). Now, it is most important for the poultry
researcher to find alternatives to antibiotic growth
promoters (AGPs) to boost the health andproduction
performanceof poultry birds (Janardhana et al., 2009;
Babazadeh et al., 2011; Vahdatpour et al., 2011). Feed
additives of plant origin have gained a great interest in the
poultry industry as they are safer, with wide dose range
and so rare adverse effects (Alzawqari et al., 2016;
Abudabos et al., 2016). Recently, many experiments had
shown a number of significant effects on growth
parameters, immune response and gut health status in birds
fed diets contain phytogens (Tanweer et al., 2014; Saeed et
al., 2015; El-Hack et al., 2016, Saeed et al., 2017f,g,h).
These studies have shown that the small intestine with the
main role in the absorption of nutrients; it then proves that,
both the proper structure and the proper function of the
intestine is efficient in improving poultry performance and
health (Sultan et al., 2014). It has been suggested that
intestinal digestion and absorption of the nutrients is
higher if the surface area of the villi is increased (Chand et
al., 2016b). The beneficial microflora of young
are counted to be somewhat irregular and can easily be
disturbed by several external factors. The subclinical
infection is one of these external factors which posed by
the pathogenic challenge. So, the ability to preserve an
optimal or normal level of beneficial microflora in the gut
becomes one of the main factors in the determination of
the ultimate health status and consequently the genetic
growth expression of poultry. At commercial basis,
available mannan-oligosaccharide has exhibited to
enhance the bird growth parameters including feed intake
and feed utilization (Hooge, 2004a; Rosen, 2007a, b;
Nikpiran et al., 2013). The beneficial impacts of MOS on
the development gut microflora were also illustrated by
Kocher et al. (2005) and Yang et al. (2008). The addition
of MOS constantly elevates the caecal beneficial
populations like Bifidobacterium and Lactobacillus spp.
(Sadeghi et al., 2013). Decreasing the pathogenicbacteria
and the increasing the beneficial bacteria could be
belonged to the receptor sites competition and producing
volatile fatty acids by bacteriocins along with IgA
antibodies by thethe hostimmune system (Kim et al.,
2009). Owing tothese changes in the beneficial microflora,
the goblet cells number and intestinal villi lengthincrease
as well, which ultimately promotesfunctions andhealth of
the host GIT (Bonos et al., 2010). The diet supplemented
with MOS has been reported to have a positive effect
regarding bodyweight, feed efficiency, egg yield, fertility,
egg mass and egg hatchability in various poultry species
(Guclu, 2011; El-Samee et al., 2012). In another study by
Iqbal et al. (2017) who had fed birds with MOS that had
significant effects on body and egg mass, egg weight,
and egg number and it has shown that feeding MOS as a
substitute for antibiotics, as growth enhancer, can
positively impact productive traits as well as health
aspects in breeders of quail. This can also improve the
manifest utilization of energy in feed and improvethe birds
feed efficiency that could partially belong to the
modulatory impacts of mannan-oligosaccharide on the
GIT microflorain broilers (Yang et al., 2008). The current
review article discusses the potential aspects of using
MOS; including its sources, mode of action and beneficial
applications of MOS and its practical uses in the nutrition
and production of poultry industry for improving,
production, immunity and safeguarding health, among
consumers and to prioritize this natural growth promoter
as opposed to synthetic antibiotics to cope the medicinal
cost in poultry.
Chemical traits and source of mannan-
oligosaccharides
Mannan-oligosaccharides originated from the
mannose blocks that exist in the yeast cell wall as it is
mostly non-digestible carbohydrates (Saccharomyces
cerevisiaeis). The cell wall consistsof up to 2530% of
cell dry weight. The Saccharomyces cerevisiae is known
yeast in the brewery and bakery industries. The MOS
product which is a derivative of the yeast is used in animal
nutrition. Saccharomyces cerevisiae cell wall involves
-glucans and mannan-proteins. The essential
building block for yeast cell wall are polymers of mannan
---3)
bounded side chains (Kogan and Kocher, 2007). The host
enzymes or the intestinal bacteria enzymes cannot break
these bonds apart and as a result carbohydrates (MOS)
have no direct nutritive value, but it has benefits in
keeping the gut health. It can be theorized from the several
scientific research work that although mannan-as a
derivate from yeast (Saccharomyces cerevisiae) is
attributed to production and processing technologies, it
might have different chemical formation and biological
efficiency as reported by Spring (1999).
96
Mode of action of MOS
The beneficial microbiota development and the
sustainment of eubiosis act an important role in the
mechanisms of defense in the body and health of gut as
well. There is elevating evidence confirming that the
composition of microflora in the gastro intestinal tract in
an adult healthy host remains statistically stable as
theorized by Williams et al. (2001). Results of current
studies suggesting that the supplementation of MOS to
poultry diets can minimize the count of hind gut
pathogenic bacteria during the high exposure to the
pathogen (White et al., 2002; Castillo et al., 2008). The
MOS supplementation was indeed accompanied with
increasing beneficial flora, especially lactobacilli (Rekiel
et al., 2007). Another experiment has also confirmed the
beneficial impact of MOS, however, it has been also found
to decline animal gut concentration of ammonia
(Juskiewicz et al., 2003). Literature documented data
indicated that dietary MOS fed diets can greatly lower the
number of pathogens. In some studies on poultry, proves
found that if the dietis supplemented with MOS a
considerable positive effect on gut histological structure in
broilers chicken (Iji et al., 2001a). Similarly,it is reported
that dietary supplementation of mannan products had the
effect of increases the ratio of villous height/ crypt depth
in young broilers (Iji et al., 2001a; Yan et al., 2008) and in
turkeys as well (Ferket et al., 2002) (Figure 1). Nochta et
al. (2010) found that the addition of mannan as feed
supplement remarkably enhanced the nutrients apparent
digestibility.
Figure 1. How do Mannan-Oligosaccharides (MOS) affect intestinal structure (MOS could prevent the colonization and
attachment of pathogenic bacteria and thus reduce the adverse effects of microflora and metabolites)
Beneficial effects of mannan-oligosccharides in
poultry
Broiler Farming
Effect on growth performance and blood
biochemistry. Mannan-oligosaccharide that is one of the
best alternatives to antibiotic growth advancers in the
poultry industry diets and which are originated from yeast
outer cell wall that known as Saccharomyces cerevisiae
( ). The use of MOS in broiler diets had
shown to positively impacts the performance criteria
(Rosen, 2007a; Fritts and Waldroup, 2003). The range of
dietary inclusion of the MOS averaged from 0.5 to 5 g /kg
diet. The dose-response of MOS in different research work
had showed the best dosage of MOS for optimal growth is
around 2 g /kg diet as reported by Tucker et al. (2003). Iji
et al. (2001b) studied the influences of different doses of
MOS (0, 1, 3 and 5 g /kg diet) on the structure and
function of the in testine of poultry birds within the starter
97
period (21-day). Results proved that poultry birds gave a
high response with the increases with MOS addition from
1 to 21 d compared with the 21-42 d period (Tucker et al.,
2003). Nikpiran et al. (2014) reported that adding the
MOS to the diets on poultry improved the growth
performance values by enhancing the feed intake and
stimulating the growth hormone and insulin release.
One of the studies had shown a significant decrease
in the total cholesterol concentration in broiler chickens
which had been supplemented with MOS @ 0.05% when
compared to a control diet (Juskiewicz et al., 2003). Also,
another experiment had shownthat MOS could promote
caecal Lactobacillus spp. and Bifidobacterium spp. growth
and also elevated the height of villus and the number of
goblet cells in poultry jejunum and ileum (Mohsen et al.,
2014).
Effect on immune response. In one study it was
found that MOS had proved to be much more effective on
antibody production against Avian Influenza virus (AIV)
in broiler chickens than Humate (HU). The immune
function could be augmented with dietary Humate and
MOS supplementation (Tohid et al., 2010). The innate
immune system recognizes key molecular formations of
the invading bacteria involving peptidoglycans,
lipopolysaccharides, and possibly the structures of
mannose in the yeasts cell walls. Oligosaccharides which
have mannose have been reported to impact the immune
system through activating mannose-binding protein
secretion from the liver. The aforementioned protein, as a
result, can enchain to bacteria and trigger the complement
cascade of the immune system of the host as described by
Newman (1994). MOS was indicated of having a
beneficial effect on both immunoglobulin status and
humoral immunity in general. Savage (1996) described an
increase in IgG of the plasma and bile IgA in poultry
grown up on diets supplemented with 0.11% MOS. The
diet fed with MOS may constitute a novel and most
effective plausible alternative that could reduce the spread
of disease by decreasing the virus shedding and the
contamination of the environment from AIV (H9N2)
infection in poultry birds (Akhtar et al., 2016). Both
Saccharomyces cerevisiae and its derived product is
known as MOS that supplementation in poultry feed has a
clear effect on the attenuation of E. coli which induces
intestinal cells disruption by reducing the intestinal
inflammation and barrier dysfunction in broilers chicken.
In addition to that, yeast (Saccharomyces cerevisiae)
addition could also improve the intestinal microbiota and
feed efficiency of in avian species (Wang et al., 2016) and
MOS may improve the absorption of trace minerals
(Sohail et al., 2011).
Layer farming
The feed supplementation with MOS has shown to
entail positive effects by improving (P < 0.01) the liver
antioxidant status and mitigating the significant increase in
the cecal pathogenic bacterial load after molt in layer
birdswhich shows the benefits of which can be improved
with MOS supplementation (Bozkurt et al., 2016). The
prebiotic (mannan-oligosaccharide) supplementation
suggests that prebiotic supplementation can positively
alter the intestinal microenvironment (Hutsko et al., 2016).
In another study by (Jahanian and Ashnagar, 2015) found
that MOS supplementation to layinghens feed under
bacterial infection could improve their productive
bacterial populations and improving nutrient digestibility.
As described by Bozkurt et al. (2012) who had shown that
egg production had efficiently improved by MOS
alsoshowed that a stimulating humoral immune response
in laying hens in different climate conditions.
Turkey farming
After the broiler production industry, the turkey
industry considered as the second source of poultry meat
across the globe. In turkeys, 76 numbers of comparisons
showed the same responses to MOS as in broilers (Hooge,
2004b; Rosen, 2007b). Hooge (2004b) claimed that MOS
addition to turkey rations revealed an average increase in
body weight by2% and reductionmortality by about25%.
So, organic enteric conditioners, such as dietary
MOS, are of great importance for the turkey farming
industry. Recently, antibiotic resistance had been raised in
the Escherichia coli exist in the field which had been
isolated from commercial turkey farms in North Carolina.
In addition to that, a resistance to the Enrofloxacin had
been showed (Bernick et al., 1999). There is no specific
proof that that growth promoting doses of antibiotics
control disease (Gustafson and Bowen, 1997), the debate
over the Gram-negative bacteria that had been showing
some resistance, as shown by Salmonella and E. coli,
which caused the strongest objection to the use of
antibiotic as growth promoters (Scioli et al., 1983).MOS
improves the performance of turkey poults, especially
during the E. coli challenge like antibiotics which were
traditionally used (Ferket et al., 2002). An improvement in
growth performance was also observed in turkeys fed diets
enriched with MOS (Savage and Zakrzewska, 1996).
Authors found a statistical increase in body weight gain in
Large White male poults which fed a diet supplemented
98
with 0.11% MOS. Also, it has been reported by (Cetin et
al., 2005) that MOS enhanced immunoglobulin levels and
more positive effect on growth performance, production
and the turkeys' ability to resist diseases. As a result of the
previous finding, it can be concluded that MOS is an
interesting alternative to antibiotic growth promoters to
improve performance (Parks et al., 2001). Also, a clear
effect on improving body weight gain and lowering
mortality in turkey birds (Hooge et al., 2004a).
Mannan-oligosccharides: The best organic
alternative to antibiotic growth promoters
In contrast, regarding the action mode of the
chemical growth promoters (antibiotics) fermentable
carbohydrates sources, oligosaccharides especially MOS,
act as one of the best alternatives to the Gram-negative
pathogens attachment sites, so they prevent the attachment
to the enterocytes and subsequently prevents the enteric
infection. The adherence step of the pathogenic microbe
to the intestinal cell wall is known to be the prerequisite
step to the infection (Gibbons and Houte, 1975). This can
be more clarified as in Vibrio cholera which is incapable
of starting their disease signs without the attachment step
to the enterocyte, even with large numbers of bacteria
present (Freter, 1969). The adhesion step causes the
bacterial entrapment and colonizing. The entrapment of
nutrients for growth, the concentration of the digestive
enzymes and the toxins onto intestinal cell wall, and the
possible prevention of antibody attachment to the
pathogenic cell (Costerton et al., 1978). The cell wall of
the yeast organism is mostly carbohydrates and proteins in
the form of mannose, glucose, and N-acetylglucosamine
that are branched and chained together (Ballou, 1970).
Mannan-oligosaccharides that are derived from mannans
on yeast cell surfaces are acting effective binder to the
bacterial binding sites (Ofek et al., 1977). Pathogens that
are mannose-specific Type-1 fimbriae are confused and
adsorbed to the MOS, leaving the enterocytes without
colonization. In the study of Newman (1994), that had
shown that the presence of dietary Mannan-
oligosaccharides in the intestine had successfully
discarded some pathogenic bacteria that had the possibility
of attachment to the lumen of the intestine. Mannose was
shown by (Oyofo et al., 1989a) to inhibit the in vitro
attachment of Salmonella typhimurium to intestinal cells
of the day old broilers chicken. A study by (Oyofo et al.,
1989b) had shown that dietary mannose had a successful
effect on inhibiting Salmonella typhimurium in intestinal
colonization in broilers. (Spring et al, 2000) had shown an
effort in screening different bacterial strains to examine
their ability to agglutinate mannan-oligosaccharides in
yeast cell preparations (Saccharomyces cerevisiae, NCYC
1026). Which showed that the inclusion of MOS in the
diet can improve the poultry birds' performance, especially
during challenging with E. coli, as well as being used as
growth promoter antibiotics in poultry industry? A
comparison of some attributes with dietary mannan-
oligosaccharides and antibiotics is shown in Table 1,
(Ferket et al., 2002).
Table 1. Comparison of some attributes with dietary
mannan-oligosaccharides and antibiotics.
Antibiotics
Mannan-oligosaccharides
(MOS)
It reduces the non-specific
immunological protection in the
mucosa as a result of reducing
both beneficial and non-
beneficial bacteria (i.e.
lactobacilli)
It can increases non-specific
mucosal immunological
protection by increasing
relatively the goblet cell
numbers and consequently
the mucus secretion and it
increases the colonization of
beneficial bacteria in thegut.
It improves AME and reduces
the energy needed for
maintenance which
consequently improves the net
energy availability
It improves net energy
available for production by
improving dietary AME
It improves growth
performance parameters under
various environmental
conditions
Improves growth
performance parameters
mainly when challenged
with enteric pathogens
By suppressing enteric
microflora it suppresses the
competition for the nutrients.
It improves the brush border
health so it enhances the
absorption process.
prolonged or Improper usage
can produce antibiotic resistant
pathogens
It will not produce bacterial
resistance
Reduces immunological stress
via lowering enteric microbial
load
It's important role to
stimulate gut-associated
system immunity by acting
as a non-pathogenic
microbial antigen
Decreases adverse effects of
microflora metabolites by
decreasing the microflora
Decreases the adverse effects
of microflora metabolites by
changing microflora profile
It inhibits both the viability and
proliferation of some pathogens
and beneficial enteric
microflora
It acts as a barrier against the
attachment and consequent
colonization of some enteric
bacteria, but it is not
bactericidal.
99
Figure 2. A flow diagram illustrating a large surface area is vital for optimal digestive function and nutrient absorption in
poultry birds.
CONCLUSION
After reviewing the compiled literature it can be fully
clarified that MOSs can be considered as a potential
alternative to antibiotic growth promoters, and even at
trace amounts @ 0.1%-0.4% practically usage as
commercial feed additive in poultry nutrition would be
quite effective in improving the health status and
production performance of poultry. Among consumer
concerns about danger increasing of antibiotic-resistant
pathogens has urged the poultry nutritionist to consider
published literature it is clear now that MOS is considered
one of the best alternatives to antibiotic growth promoters.
These mannan-oligosaccharides are non-digestible
carbohydrates that may have greater benefits than
antibiotics if it is used in a synergic way with other non-
pharmaceutical enteric conditioners, such as
fructooligosaccharides, probiotics, bioactive peptides, and
some herbs and it would, in this manner, be a helpful
additive to reduce feed cost in the poultry industry.
Acknowledgements
All the authors of the manuscript thank and
acknowledge their respective Universities and Institutes.
Competing interests
Authors declared that they have no conflict of
interest.
Author`s contributions
All the authors significantly contributed to compile
and revise this manuscript. MS, MAA, reviewed the
literature and initiated the review compilation. MEAEH,
ZAB and ME, critically revise the manuscript. FA and
MEAEH check the English language accuracy. Finally all
authors read and approve the manuscript for publication.
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