Influence of kappa-casein genotype on milk yield of cows and on culling of cows
https://doi.org/10.32634/0869-8155-2022-361-7-8-110-113
Abstract
For production of milk the breeds of highly productive dairy cows of domestic and foreign selection are used. These breeds include the Black-and-white mottled breed, which makes up more than 51% of the total cattle herd in Russian Federation, and the Holstein breed, which share is more than 15% and is constantly increasing. It has been established that cows with different kappa-casein genotypes differ in usability of their milk for cheese production. The research of influence of kappa-casein genotype on milk yield capabilities of cows and the reasons for culling of cows is relevant and of interest nowadays. The biggest share of the herd consists of cows with AA genotype, and the least share, 3.8%, consists of the most favorable BB genotype cows. These cows feature higher milk yield. Though there was no significant difference between the milk yield of cows with genotype BB and genotypes AA and AB, but a tendency for BB genotype superiority was clearly observed. The higher milk yield determines a higher yield of nutrients with milk. The group with the AB kappa-casein genotype accounted for a greater share of culled cows in the first lactation period. The lower rejection rate was recorded in the group of BB genotype cows.
About the Authors
O. V. Gorelik
Ural State Agrarian University;
Ural Federal Agrarian Research Center of the Ural Branch of the Russian Academy of Sciences
Russian Federation
Russian Federation
Olga Vasilyevna Gorelik, Doctor of Agricultural Sciences, Professor
Yekaterinburg,
D. A. Afonina
Ural State Agrarian University;
Ural Federal Agrarian Research Center of the Ural Branch of the Russian Academy of Sciences
Russian Federation
Russian Federation
Darya Alekseevna Afonina, research associate, graduate student
Yekaterinburg
A. A. Belookov
South Ural State Agrarian University
Russian Federation
Russian Federation
Alexey Anatolyevich Belookov, Doctor of Agricultural Sciences, Associate Professor
Troitsk
S. L. Safronov
St.Petersburg State University of Veterinary Medicine
Russian Federation
Russian Federation
Sergey Leonidovich Safronov, Doctor of Agricultural Sciences, Associate Professor
Saint Petersburg
N. I. Kulmakova
Russian State Agrarian University — Moscow Timiryazev
Agricultural Academy
Russian Federation
Russian Federation
Natalia Ivanovna Kulmakova, Doctor of Agricultural Sciences, Associate Professor
Moscow
I. V. Bobyleva
South Ural State Agrarian University
Russian Federation
Russian Federation
Irina Valeryevna Bobyleva, Candidate of Agricultural Sciences, Associate Professor
Troitsk
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Review
For citations:
Gorelik O.V., Afonina D.A., Belookov A.A., Safronov S.L., Kulmakova N.I., Bobyleva I.V. Influence of kappa-casein genotype on milk yield of cows and on culling of cows. Agrarian science. 2022;1(7-8):110-113. https://doi.org/10.32634/0869-8155-2022-361-7-8-110-113
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