УДК 636.2.082.2.034
P. S. Galushina, O. A. Bykova
Summary Milk plays a crucial role in the human diet, and is also a valuable raw material for processing in the dairy industry. The bulk of milk is obtained from cattle, which determines the leading role of cattle breeding in the development of domestic animal husbandry. To date, the majority of livestock in agricultural enterprises has a bloodline of over 87.5% for the Holstein breed, which makes it possible to classify these animals as the Holstein breed. Three groups of animals (n=25) were formed for the study: the first group consisted of the daughters of the De Su bull (USA), the second - the daughters of the Sayan bull (Denmark), and the third - the daughters of the Tuareg bull (Germany). The highest values of milk productivity were recorded in the daughters of the bull-producer Sayan - 7845 kg of milk. The lowest milk yield during lactation was recorded in the daughters of the Tuareg bull - 7456 kg. In terms of the mass fraction of fat in milk, the daughters of the De Su bull (4.34%) were the best, while the daughters of the Tuareg bull (3.15%) were the best in terms of the mass fraction of protein. The descendants of the Sayan bull were in the lead in terms of nutrient output, releasing 560 kg of milk fat and protein. The cows, the daughters of all the bulls of the producers, belonged to the dairy sector of productivity, demonstrating a high level of productivity.
Keywords: holstein breed, breeding bulls, milk, productivity, milk yield, mass fraction of fat, mass fraction of protein, quantity of milk fat and protein.
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