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Searching for the associations between the gene polymorphism and the reproductive traits is essential in defining the genetic native breed specificity, which distinguishes them from the other breeds. The aim of our study was to determine the associations between mutations in the  PRL ,  PRLR ,  PTGS2 ,  FUT1  genes and sexual and periparturient activity in native Pulawska gilts. The analysis included 72 animals which gave birth to the first litter. Evaluation of the productive value of gilts accounted for indicators of sexual and periparturient activity as well as reproductive traits. The biological material for molecular analyses was obtained from the hair roots of the gilts. The genotype was verified by PCR RFLP analysis. The primers and PCR conditions were determined on the basis of available literature data. Statistically significant differences (P≤0.05) were found at the  PRL  locus: gilts of  AA  genotypes ( Ins/Ins ) at the  PRL  locus were characterised by longest farrowing duration compared to gilts of  AB  genotype (P≤0.05). The analysis of  PRLR  gene showed that gilts of  TT  genotype revealed a tendency for later occurrence of estrus signs (first and second estrus) and for the markedly longest farrowings (P≤0.05). With regard to  PTGS2  and  FUT1  loci, no significant differences were found in the parameters of sexual and periparturient activity of the gilts. However, gilts of  FUT1 GG  genotype gave birth to and reared the largest first litters (P≤0.05). The results of the studies expand the knowledge about the genetic structure and productivity of Pulawska gilts.

Estrus Behaviour and Reproductive Traits of Pulawska Gilts Associated with Selected Gene Polymorphisms