| Autor: |
Gorelik, O. V., Lihodeevskaya, O. E., Zezin, N. N., Sevostyanov, M. Ya., Leshonok, O. I. |
| Předmět: |
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| Zdroj: |
AIP Conference Proceedings; 6/22/2022, Vol. 2467 Issue 1, p1-5, 5p |
| Abstrakt: |
In the Sverdlovsk region, Holsteined black-and-white cattle of the Ural type are bred. They are represented by large, highly productive animals with a high genetic potential for productivity. The aim of the work is to study the dynamics of productive qualities of Holsteined black-and-whhite cattle with a high proportion of kinship in the Holstein breed and their relationship. The milk yield per lactation increases, reaching the maximum during the third lactation. The increase in productivity was 1409 kg or 14.9% relative to the first lactation. Changes in the quality indicators of milk, which fluctuated depending on lactation, were defined and a tendency to an increase in the mass fraction of fat in milk from the first to third lactation was revealed. The highest indicators of mass fraction of fat were found in the second lactation. During the same lactation, the highest protein content in milk was observed - 3.26%. Due to the increase in milk yield and quality indicators of milk, there is an increase in the amount of milk fat and milk protein per lactation from 679 kg (first lactation) to 782 kg (second lactation). The relationship between milk yield and quality indicators of milk - mass fraction of fat and mass fraction of protein varies depending on lactation. With an increase in milk yield, a decrease in the mass fraction of fat and protein in milk is observed. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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