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The dairy cattle breeding development depends largely on the culture of raising young animals of the cattle. Production and maintaining healthy young animals is an extremely challenging task for livestock breeders [1,3,12,14]. Breeding of dairy replacement heifers is considered a major element of the breeding system and milk production technology, since the formation of milk production takes place just in the process of growth and development. Individual selection of parental pairs affects not only the cattle reproductive ability, but also the growth of offspring [2, 4,13], [5-11].

Exterior and constitutional features of first-calf cows of black-and-white cattle of different genotypes