Abstract
Creation of pedigree herds of dairy cattle with desirable β-casein genotypes in the Republic of Belarus is an urgent task of domestic dairy cattle breeding. Currently, along with the evaluation of basic selection traits, many countries around the world test and select cows with desirable β-casein genotypes in order to improve the quality characteristics of milk. The article presents the results of evaluation of 252 cows of breeding herds of different breeds for β-casein genotypes by the RFLP method, bred in SE “ZhodinoAgroPlemElita” of Smolevichi district, JSC “Gorodeya” of Nesvizh district, SE “Experimental base “Krinichnaya” of Mozyr district and UAE “Noviy Dvor – Agro” of Svisloch district. The Simmental cows showed the best ratio of desirable A2A2 and undesirable A1A1 genotypes – 64.0 and 4.0% respectively. To create breeding herds as well as to select dams of replacement bulls taking into account β-casein genotypes, preliminary selection of replacement heifers with the desirable genotype A2A2 is required.
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