Iraqi Journal of Biotechnology, 2016, Vol 15, No 1 , 33 45 Effect of G1705A SNP in Growth Hormone Gene on the Productive and Physiological Performance in Broiler Chicken Bassam G M Al khatib, Dihya H. Abstract: In this study two commercial broiler hybrids were used (Cobb500 and HubbardF15) to detect the G1705A SNP in the third intron of chicken GH gene and investigate its effect on the productive and physiological performance in broiler chicken. PCR RFLP method was used to identify this SNP, three genotypes were found when using of Eco RV restriction enzyme wild genotype GG, heterozygous GA and homozygous AA. Highly significant difference (p