Abstract

The aim of this work was to determine the dependency between polymorphism in the PRL locus g.8398G > A and fertility rates, bodyweight of cows and calves, the course of parturition and viability of calves in Polish Black-and-White Holstein-Friesian cattle. Three genotypes (AA, AG, and GG) were identified with a frequency of 0.0293, 0.3672 and 0.6035. The frequency of the G and A alleles was respectively, 0.7871 and 0.2129. There was a significant dependency between the genetic variant in locus g.8398G > A of the PRL gene and age at first insemination, age at first calving, insemination index, length of pregnancy, length of the dry period and weight of male calves after parturition. The AA homozygotes were characterized by more favorable values of selected reproduction indices; the cows of that genotype and male calves coming from these animals were characterized by the lowest weight after parturition.

摘要

这项工作的目的是确定PRL基因座 g.8398G > A中的多态性与生育率、母牛和小牛体重、波兰黑白荷斯坦-弗里斯兰牛的分娩过程和小牛活力之间的依赖性. 以 0.0293、0.3672 和 0.6035 的频率鉴定了三种基因型（AA、AG 和 GG）。G和A等位基因的频率分别为0.7871和0.2129。PRL基因座g.8398G > A中的遗传变异之间存在显着依赖性基因和初次授精年龄、初次产犊年龄、授精指数、妊娠期长短、干奶期长短和公牛产后体重。AA 纯合子的特征是选择的繁殖指数更有利；该基因型的母牛和来自这些动物的雄性小牛的特点是分娩后体重最低。