lack of association between somatotropin receptor gene polymorphism and birth weight of iranian indigenous sistani cattle

the objective of the present study was to determine polymorphism within the promoter region of somatotropin receptor genes in indigenous sistani cattle (bos indicus) and associations between this polymorphism and breeding value of birth weight. the pedigree structure was included by considering 1173 animals with 600 progeny birth weight data obtained from a zhark breeding station in sistan and baluchistan. heritability was estimated for birth weight using different univariate models with the derivative-free approach of restricted maximum likelihood algorithm (dfreml). the average weight of each birth was 23.9 ± 3.16 kg. the effects of non-genetic factors were significant (p