Association of genetic variants of bovine prolactin with milk production traits of Black-and-White and Jersey cattle

Associations between polymorphism localised in the third exon of the prolactin gene (PRL-Rsal) and milk production traits of Black-and-White and Jersey cattle were analysed. A total of 427 cows were included in the study. PCR-PFLP method was used. The frequencies of genotypes and alleles were as follows: 0.7107 - AA, 0.2851 - AB, 0.0042 - BB; 0.8533 - PRLA and 0. 1467 - PRLB for Black-and-White cattle and 0.0919 - AA, 0.4324 - AB, 0.4757 - BB; 0.3081 - PRLA and 0.6919 - PRLB for Jersey cattle. Statistically significant differences between the breeds were observed in the frequencies of genotypes and alleles. Associations between PRL-Rsal polymorphism and milk production traits of Jersey cows and lack of associations with these traits in Black-and-White cows were observed.