Abstract
Studies show that according to the prolactin gene (PRL), the highest milk yield was determined in the first-calf heifers with the PRLAB genotype by 2.5%, and in cows of the second and third lactations – with the PRLAA genotype by 0.8-7.0%. In terms of fat and milk protein content, animals with the PRLAB genotype had higher rate than those with the PRLAA genotype by 0.1-0.2 pp, the second and especially third lactation animals having the most noticeable changes. For the beta-lactoglobulin (BLG) gene, animals with the BLGBB genotype had the higher rate of milk yield for 305 days of lactation, as well as the amount of milk fat and lactoprotein. With an increase in the lactation ordinal number, the difference in these indices between the BLGAB and BLGAA herdmates increased.
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