A comparison of four ideal profiles of amino acid's effect on broiler performance and immune system

In order to compare the effects of four ideal profiles of amino acid on broiler performance and immune system, this study conducted in randomized complete block design with four treatments N.R.C. (1994), Feedstuff (2008), Evonik-Degussa (2006) andCobb 500 Nutrition Supplement (2008) and four blocks each in 42 days feeding. 384 day old Cobb 500 chicks were used. At the end of each feedingphase (10, 24 and 42 days), birds and feed intake were weighted. In 21stand 42nd days from each pen 3 birds were selected and blood sampled to observe the effect of profiles on blood titer (HI) against Newcastle virus. At the end of trial, from each pen 3 birds were slaughtered and carcass analysis was done. Results showed no significant difference in weight gain, feed intake, feed conversion ratio, blood titer on 21st day and carcass compartements percentage among treatments.Just N.R.C. with highest blood titer, showed significant difference (P≤0.05) on 42nd days with Evonik-Degussa. Also from economic point, N.R.C. showed lowest expense for per kilogram live weight and the most per hen selling income.