Effect of dietary supplemental wheat starch by-product on growth performance, carcass Traits and immune responses of broiler chickens.

This is the authors' abstract. We don't add key points for this paper.

This experiment was conducted to investigate effects of a wheat starch by-product (WSB) on growth performance, carcass traits and immune responses of broiler chickens.A total of 300 one-day old broiler chicks (Ross 308) were assigned to 5 dietary treatments and 5 replicates in a completely randomized design during 9 to 16, 17 to 25, 26 to 39, and 40 to 50 days of experiment.Dietary treatments included a basal diet without WSB supplementation (CTL) or graded levels of low (LSS; 100, 150, 200, and 250 g/kg), medium (MSS; 200, 250, 300, 350 g/kg), high (HSS; 300, 350, 400, 450 g/kg) and extra (ESS; 400, 450 500, and 550 g/kg) inclusion rates of wheat starch during the starter, growing, finisher 1, and finisher 2 periods, respectively.Dietary supplementation of WSB did not have adverse effect on growth and feed conversion ratio of broiler chickens across 9 to 25 days of age but compromised growth performance during finisher and the entire rearing periods (P ˂ 0.05).Feeding diets containing WSB decreased carcass yield in broiler chickens (P ˂ 0.05).Antibody titer against Newcastle disease virus decreased following dietary HSS and ESS supplementation (P ˂ 0.05).Moreover, supplementation of LSS and ESS to the feed decreased relative weight of spleen (P ˂ 0.05).In conclusion, dietary supplementation of WSB is recommended up to 450 g/kg across 9 to 25 days of age without any adverse effect on growth performance of broiler chickens.However, supplementation of WSB may impair immune responses of broiler chickens.