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Asian-Australas J Anim Sci > Accepted Articles
DOI: https://doi.org/10.5713/ajas.19.0220    [Accepted] Published online July 1, 2019.
Influence of dietary supplementation of autolyzed whole yeast and yeast cell wall products on broiler chickens
Emmanuel Uchenna Ahiwe1,2,*  , Medani Eldow Abdallh1,3, Edwin Peter Chang’a1,4  , Apeh Akwu Omede1,5  , Mohammed Al-Qahtani1, Harriet Gausi1, Hadden Graham6, Paul Ade Iji1,7 
1School of Environmental and Rural Sciences, University of New England, Armidale NSW, 2351 Australia
2Department of Animal Science and Technology, Federal University of Technology, Owerri, PMB 1526, Imo State, Nigeria
3Department of Poultry Production, University of Khartoum, Khartoum 13314, Sudan
4Tanzania Livestock Research Institute (TALIRI), P. O. Box 352, Mwanza, Tanzania
5Department of Animal Production, Kogi State University, Anyigba, PMB 1008, Kogi State, Nigeria
6AB Vista UK, Marlborough, Wiltshire, SN8 4AN, UK
7College of Agriculture, Fisheries and Forestry, Fiji National University, Koronivia, Fiji
Correspondence:  Emmanuel Uchenna Ahiwe,Email: emmaahisco@gmail.com
Received: 18 March 2019   • Revised: 2 June 2019   • Accepted: 11 June 2019
This study evaluated the effect of yeast products on growth performance, visceral organ weights, endogenous enzyme activities, ileal nutrient digestibility and meat yield of broiler chickens fed diets containing autolyzed whole yeast (WY) and yeast cell walls (YCW) at varying levels of inclusion.
Nine dietary treatments consisting of WY or YCW included at 0.5, 1.0, 1.5 or 2.0 g/kg diet and a control diet without yeast supplementation was used in the experiment. Each of the nine treatments was replicated six times with nine birds per replicate. Birds were housed in cages, in climate-controlled rooms and fed starter, grower and finisher diets.
There was an improvement (p<0.05) in body weight gain (BWG) and feed conversion ratio (FCR) on d 10, 24 and 35 for birds fed 1.0-2.0 g/kg WY or YCW diet. Small intestine weight was heavier on d 10 and 24 for birds on higher levels of WY and YCW compare to the control group. On d 10 and 24, there was a significant increase (p<0.05) in tissue protein content and pancreatic enzyme activities (trypsin and chymotrypsin) of birds on 1.5-2.0 g/kg WY and YCW diets compared to the control group. Compared to the control group, birds on WY (2.0 g/kg diet) and YCW (at 1.5 and 2.0 g/kg diet) had better (p<0.05) protein digestibility on d 24. On d 35, there was significant improvement (p<0.05) in percentage of carcass, absolute and relative breast weight for broiler chickens fed WY and YCW mostly at 2 g/kg diet compared to birds on the control diet.
Supplementation of diets with autolyzed WY and YCW products especially at 1.5-2.0 g/kg diet improved broiler chicken performance and meat yield through their positive effects on ileal protein digestibility and pancreatic enzyme activities.
Keywords: Chickens; Yeast; Performance; Ileal Digestibility; Enzyme Activities; Meat Yield

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