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Advances in Animal and Veterinary Sciences

Research Article
Adv. Anim. Vet. Sci. 6(10): 395-405
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Anaam E. Omar1, Shimaa A. Amer*1, Wafaa A. M. Mohamed2, Ali Osman3, Mahmoud Sitohy3

1Department of Nutrition and Clinical Nutrition, Faculty of Veterinary Medicine, Zagazig University, 44511, Egypt; 2Department of Clinical Pathology, Faculty of Veterinary Medicine, Zagazig University, Zagazig, 44511, Egypt; 3Biochemistry Department, Faculty of Agriculture, Zagazig University, 44511, Zagazig, Egypt.

Abstract | This study was designed to study the effect of single or co-dietary inclusion of native soy protein isolate (NSPI) and/ or methylated soy protein isolate (MSPI) on growth performance, small intestine histology and immune status of broiler chickens. For this purpose, 250 one-day old broiler chicks (Ross 308 broiler) were randomly assigned into five experimental groups with five replicates per group (50chicks/group). The experimental treatments include; T1: control group (basal diet without additives); T2: basal diet + 2%NSPI + 0% MSPI (2NSPI:0MSPI); T3: basal diet + 0%NSPI + 2% MSPI (0NSPI:2MSPI); T4: basal diet + 1%NSPI + 1% MSPI (1NSPI:1MSPI); T5: basal diet + 2%NSPI + 2% MSPI (2NSPI:2MSPI). The experimental period was 35 day and water and feed were provided ad-libitum. Results revealed that chickens fed diets supplemented with 2NSPI:0MSPI and 1NSPI:1MSPI had significant (P<0.05) heavier final BW, BWG and best FCR compared to other dietary treatments. Liver, bursa and thymus percentages significantly (P<0.05) increased in broilers fed on diets supplemented with 0NSPI:2MSPI and 2NSPI:2MSPI as compared to control group. Gamma globulins and growth hormone were significantly increased by single or double dietary supplementation with NSPI and MSPI. Inclusion of 2NSPI and 1NSPI:1MSPI resulted in broad and thickened villous tips in most intestinal villi and an increase in the absorptive surface. Taken together, single supplementation with 2% NSPI or co-dietary supplementation with 1NSPI:1MSPI had positive effect on growth performance and gut health. Both single and co-dietary supplementation with NSPI and MSPI had potential effects on the immune status of broiler chickens.

Keywords | Broiler chickens, Soy protein isolate, Growth performance, Immunity, Gut histology.