Reproductive qualities of cows with varying degrees of inbred
https://doi.org/10.32634/0869-8155-2025-393-04-88-94
Abstract
In dairy herds of Holstein cattle, there is an increase in the number of animals obtained as a result of closely related breeding and inbreeding, which is associated with the long-term use of Holstein breeding bulls, which are obtained using inbreeding to preserve and enhance beneficial traits.
The aim of the work is to study the reproductive qualities of cows depending on the type of selection and the degree of inbreeding.
It has been established that in almost all groups there is an excess of the optimal length of the technological period of 365 days. This difference ranges from 16 days (close inbreeding) to 33 days (close inbreeding). In the other groups, the difference is between these figures. Moreover, the difference between cows with close inbreeding and other groups of animals in terms of the length of the interbody period is significant at p< 0.05–0.01 in favor of the former. The CFS was in the range of 0.92–0.93 in all groups of cows, regardless of the degree of inbred. The exception was cows with close inbreeding, but their number was insignificant compared to other groups. There is no definite relationship between the duration of the service period and milk yield during lactation. An increase in the duration of the service period does not significantly affect the milk yield for lactation in cows of outbred origin, which, with sufficiently high rates of its continuation, are inferior in milk yield to cows of other groups, with the exception of cows obtained as a result of close inbreeding.
About the Authors
S. Yu. Kharlap
Ural State Agrarian University
Russian Federation
Russian Federation
Svetlana Yurievna Kharlap, Candidate of Biological Sciences, Associate Professor
42 Karl Liebknecht Str., Yekaterinburg, 620075
A. S. Gorelik
Ural Institute of the State Fire Service of the Ministry of Civil Defense, Emergencies and Disaster Response of the Russian Federation
Russian Federation
Russian Federation
Artyom Sergeevich Gorelik, Candidate of Biological Sciences
22 Mira Str., Yekaterinburg, 620062
O. V. Gorelik
Ural State Agrarian University
Russian Federation
Russian Federation
Olga Vasilyevna Gorelik, Doctor of Agricultural Sciences, Professor of the Department of Biotechnology and Food Products
42 Karl Liebknecht Str., Yekaterinburg, 620075
M. B. Rebezov
Ural State Agrarian University ; Gorbatov Research Center for Food Systems
Russian Federation
Russian Federation
Maksim Borisovich Rebezov, Doctor of Agricultural Sciences, Candidate of Veterinary Sciences, Professor of the Department of Biotechnology and Food Products; Doctor of Agricultural Sciences, Candidate of Veterinary Sciences, Professor, Chief Researcher
42 Karl Liebknecht Str., Yekaterinburg, 620075
26 Talalikhin Str., Moscow, 109316
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Review
For citations:
Kharlap S.Yu., Gorelik A.S., Gorelik O.V., Rebezov M.B. Reproductive qualities of cows with varying degrees of inbred. Agrarian science. 2025;1(4):88-94. (In Russ.) https://doi.org/10.32634/0869-8155-2025-393-04-88-94
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