Estimation of Dietary Threonine requirement for starter period of broilers based on the Performance and Immune Responses Criterion
Journal Title: International Research Journal of Applied and Basic Sciences - Year 2013, Vol 5, Issue 3
Abstract
this study was conducted to determine the effects of supplementingThr onthe performance and immune responses of broiler chickens challenged with newcastell Disease (ND) and estimation of Thr requirement based on different response criterion. A total of 216one-day-old male broiler chicks were assigned tosix dietary treatments. Chickens were fed by six graded levels of Thr100%NRC(0.8), 120%NRC(0.96), 140%NRC(1.12), 160%NRC(1.28), 180%NRC(1.44), 200%NRC (1.6). All birds were challenged with a commercial live-ND vaccine. Body weight gains (BWG), feed conversion ratio (FCR) and carcass characterization (breast, thigh and fat pad percentage) were significantly influenced by dietary Thrlevels. With increasing Thr level up to 1.12% of diet performance improved significantly and with higher than this level deceased. Antibody titeragainst ND was influenced by Thr levels. On 7 and 14 days after ND challenge, antibody titer against ND of broilers that receive diet containThr higher than NRC recommendationwere significantly higher than that receive lower level and the highest antibody level find in 1.12% Thr in diet.The results obtained on the present study indicated that Thr requirements of broiler based on recommendation of NRC are not sufficient to meet therequirement of the new commercial poultry and commercial broiler companies under non-hygieniccondition.
Authors and Affiliations
Mohammad javad Babaee (M. Sc. )| Department of Animal Sciences, Tabriz branch, Islamic Azad University, Tabriz, Iran, email : m.j.babaee@gmail.com
Keywords
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