الفهرس 
Nutritional studies on Mannan Oligosaccharide in broilers nutrition
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Abstract
This experiment was conducted to study the effects of adding Mannan
Oligosaccharides (MOS) as replacer to Antibiotic (Lincomycin) on productive
performance, relative organs weight, nutrient digestibility, some blood parameters,
and cecum microbiota of broiler chickens using a total of 180 one–day- old Ross
broiler chicks randomly divided to control group fed a basal diet and four dietary
treatments with six replicates for each. The four treatments were fed a basal diet
supplemented with different levels of Mannan oligosaccharides 0.5, 1, and 2 g/Kg
diet and Lincomycin 4.4 mg/Kg diet during 35 days feeding trial. At all experimental
periods, the group fed a basal diet supplemented with 2 g MOS/Kg feed had
considerably higher body weight and weight gain, while having the lowest feed
consumption and best feed conversion ratio compared to the other treatment groups.
Moreover, dietary supplementation of Bio-MOS resulted in a significant decrease in
the counts of ceacal E. coli and Enterococcus, while Lactobacillus and Yeast bacteria
counts were significantly higher, compared to non-supplemented groups. Chicks
having 2 g MOS/kg diet recorded lower values of cholesterol, LDL (low-density
lipoprotein), urea, and liver enzymes AST (Aspartate transaminase), ALT (alanine
aminotransferase), compared to the other experimental groups, but, HDL (highdensity lipoprotein) of such group was significantly higher compared to other
experimental groups. group treated by MOS 2 g/Kg feed improved all tested
nutrients digestibility as compared to the control group, Additionally, MOS
supplementation also increased the intestinal villi length, width, and crypt depth and
decreased intestinal inflammation, compared to the control group. In conclusion,
supplementation of MOS at 2 g/kg diet improved growth performance, digestibility,
and blood parameters without having adverse effects on the intestine of broiler
chickens, comparable to the lincomycin.