University of Guilan Animal Production Research 2252-0872 6 2 2017 08 23 Effect of different ideal amino acid ratios on immune response, blood profile and carcass characteristics of broiler chicks during finisher period Effect of different ideal amino acid ratios on immune response, blood profile and carcass characteristics of broiler chicks during finisher period 63 73 2303 10.22124/ar.2017.2303 FA E. Salehifar Assistant Professor, Department of Animal Science, Mashhad Branch, Islamic Azad University, Mashhad, Iran M. Shivazad Professor, Department of Animal Science, Science and Research Branch, Islamic Azad University, Tehran, Iran F. Foroudi Associatet Professor, Department of Animal Science, Varamin Branch, Islamic Azad University, Varamin, Iran M. Chamani Associate Professor, Department of Animal Science, Science and Research Branch, Islamic Azad University, Tehran, Iran R. Bahari Kashani Assistant Professor, Department of Animal Science, Mashhad Branch, Islamic Azad University, Mashhad, Iran Journal Article 2017 02 01 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 (<em>P</em><0.05). The effect of different ideal amino acids ratios on the amount of uric acid (8.542) and urea nitrogen (1.850) ideal was significant (<em>P</em><0.05). The relative weight of carcasses was observed in NRC (71.867%), Arian (71.804%), ROSS (70.824%) and RPAN (71.091%). When comparisons were made among immune response, blood factors and carcass characteristics, the most significant improvements were observed by RPAN ratios in this 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 (<em>P</em><0.05). The effect of different ideal amino acids ratios on the amount of uric acid (8.542) and urea nitrogen (1.850) ideal was significant (<em>P</em><0.05). The relative weight of carcasses was observed in NRC (71.867%), Arian (71.804%), ROSS (70.824%) and RPAN (71.091%). When comparisons were made among immune response, blood factors and carcass characteristics, the most significant improvements were observed by RPAN ratios in this period. https://ar.guilan.ac.ir/article_2303_9d4e07764a619acaa3cb67eddc3a67ad.pdf