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The induction and regulation of broodiness is of the most important role of   prolactin in avian species. In this study, the association between prolactin   promoter region alleles and reproductive traits in Fars native turkey was   investigated. These traits consisted of mean egg weight (MEW), number of egg   (EN) and egg mass, during the first laying period. In total, 115 laying   turkeys, randomly selected from the flock of the Breeding Center for Fars   Native turkey, and DNA was purificated from blood samples, 231 bp of   prolactin promoter region was amplified and Genotype of Samples was   determinate by PCR-SSCP technique were genotyped. Two alleles D and I were   identified. Based on the results obtained, the frequency of D and I alleles   were 0.67 and 0.33, respectively. Frequencies of DD, II and ID genotypes were   0.385, 0.044 and 0.571, respectively. The association analysis between the   polymorphism PRL gene promoter region and egg performance was carried out.   Significant relationship was found between genotypes with egg production   (P<0.01). Individuals with II genotype produced higher egg production than DD   and ID genotype. The results of current study showed that using information   of genes related to egg production could be used to improve the performance   of native turkey of East Azerbaijan province

Association of polymorphisms in the promoter region of turkey prolactin with egg performance