Assessment of influence of duration of the service period on the milk yield of cows
https://doi.org/10.32634/0869-8155-2023-366-1-49-52
Abstract
The Ural type of the Russian Black-and-White mottled breed features high rates of milk yield, good suitability for industrial milking technology, but the duration of their productive longevity is 2.4–2.6 lactations only. The decline in productive longevity is associated, in particular, with qualities of reproductive system. As a result of the conducted researches, it was found that due to elongation of lactation (over 305 days), more milk was obtained by 847–890 kg, or by 9.5–10.0%. At the same time, there is a decrease in MFF and MFP in milk for 305 days of lactation: by 0.01–0.02% for fat and by 0.02% for protein. The highest average daily milk yield was recorded in lactation duration of 305 days. The daughters of all assessed servicing bulls had the same service period of 132–134 days. It is 52–54 days higher than optimal indicators, or by 65–68%. The fertility index of cows exceeds 48%, so we can say that the fertility of cows is good. The fertility potential of the livestock is good and decrease of service period duration will increase the efficiency of dairy cattle breeding in the farm.
About the Authors
A. S. Gorelik
Ural Institute of the State Fire Service of the Ministry of Emergency Situations
Russian Federation
Russian Federation
Artem Sergeevich Gorelik, candidate of biological sciences
620137, Yekaterinburg, Mira str., 22
M. B. Rebezov
Ural State Agrarian University; V.M. Gorbatov Federal Research Center for Food Systems of Russian Academy of Sciences
Russian Federation
Russian Federation
Maksim Borisovich Rebezov, Doctor of Agricultural Sciences, Professor
620075, Yekaterinburg, Karl Liebknecht, str., 42
109316, Moscow, Talalikhin, str., 26
A. A. Belookov
South Ural State Agrarian University
Russian Federation
Russian Federation
Alexey Anatolyevich Belookov, Doctor of Agricultural Sciences, Associate Professor
457103, Troitsk, Gagarin str., 13
O. V. Belookova
South Ural State Agrarian University
Russian Federation
Russian Federation
Oksana Vladimirovna Belookova, candidate of Agricultural Sciences, Associate Professor
457103, Troitsk, Gagarin str., 13
N. I. Kulmakova
Russian State Agrarian University — Moscow Agricultural Academy named after K.A. Timiryazev
Russian Federation
Russian Federation
Natalia Ivanovna Kulmakova, Doctor of Agricultural Sciences, Associate Professor
127550, Moscow, Timiryazevskaya str., 49
S. L. Safronov
St. Petersburg State University of Veterinary Medicine
Russian Federation
Russian Federation
Sergey Leonidovich Safronov, Doctor of Agricultural Sciences, Associate Professor
196084, St. Petersburg, Chernigovskaya str., 5
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Review
For citations:
Gorelik A.S., Rebezov M.B., Belookov A.A., Belookova O.V., Kulmakova N.I., Safronov S.L. Assessment of influence of duration of the service period on the milk yield of cows. Agrarian science. 2023;(1):49-52. (In Russ.) https://doi.org/10.32634/0869-8155-2023-366-1-49-52
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