Abstract
Genotyping for locus PGR (progesterone receptor gene) of the Holstein servicing bulls (World Wide Sires) was carried out. The frequencies of alleles and genotypes of this locus are given. Significant (P < 0.05) superiority of the homozygous genotype AA of locus PGR was found in relation to the heterozygous genotype AG for several economically valuable traits: PTAM (predicted transmitting ability for milk, 380 points), PL (productive life, by 1.3 months), and FE (feed cost–feeding efficiency index, 37 points). Significant superiority (P < 0.05) of the homozygous genotype GG over the heterozygous genotype AG for the PL trait was also found, by 1.2 months. The obtained data can be used for marker-dependent breeding.
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