Effect of different ideal amino acid ratios on immune response, blood profile and carcass characteristics of broiler chicks during finisher period

An experiment was conducted to determine effect of different ideal amino acid ratios on immune response, blood profile and carcass characteristics of male and female broiler chicks during finisher period (29-42 days). A total of 840 male and female broiler chicks were equally distributed to 14 dietary treatments with four pens per treatment and 15 birds per pen in a factorial arrangement 2×7 in a completely randomized design. Treatments were included different patterns of amino acid ratios and recommendations of Arian broiler (IICP, CVB, Feedstuff, NRC, ROSS, RPAN and Arian) and sex (male and female). In 35 days, injections of antigen were performed in 2 chicks from each pens and antibody titers were determined in 42 days. At the end of the experiment, blood samples were taken from two chickens each pen and then were slaughtered, the values of total protein, albumin, urea nitrogen, creatinine, uric acid, and the weight of the thymus, spleen and bursa of Fabricius and carcass components were measured. NRC (2.199) and RPAN (2.172) produced the highest antibody titer (P