Issue |
E3S Web Conf.
Volume 254, 2021
International Scientific and Practical Conference “Fundamental and Applied Research in Biology and Agriculture: Current Issues, Achievements and Innovations” (FARBA 2021)
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Article Number | 08023 | |
Number of page(s) | 6 | |
Section | Scientific Support for the Innovative Development of Animal Husbandry | |
DOI | https://doi.org/10.1051/e3sconf/202125408023 | |
Published online | 05 May 2021 |
Dynamics of correlation coefficients of economic and productive characteristics depending on the age of cows
1 Ural State Agricultural University, Karl Liebknecht str., 42, 620075 Yekaterinburg, Russian Federation
2 Ural Institute of The state fire service of the EMERCOM of Russia, Mira street, 22, Yekaterinburg, Russia
3 K.G. Razumovsky Moscow State University of technologies and management (The First Cossack University), Zemlyanoy Val, 73, 109004 Moscow, Russian Federation
* Corresponding author: pbio@ya.ru
In 2002, a new Ural type of black-and-white breed was officially registered. Animals of this type have high productivity indicators, but at the same time there is a decrease in the productive longevity of the breeding stock. The conjugacy of milk yield for lactation is established, which allows for the first lactation to carry out selection fory milk yield. The relationship of milk yield for the first lactation weakens with the age of the animals and becomes negative for the fifth lactation. The conjugacy of such characteristics as milk yield per lactation and fat mass fraction in milk varies both by lactation and relative to milk yield per lactation. The conjugacy between milk yield and protein in milk for lactation was negative with fluctuations from low to medium-negative. For 5 lactation, there is a high positive relationship between milk yield for the first lactation and protein mass fraction in milk for 5 lactation. There are fluctuations in the correlation coefficients for fat mass fraction in milk for lactations, the conjugation of the trait with each other remains positive in the period from the first to the 4 lactation, excluding the correlation coefficient of this indicator between 1 and 5 lactation.
© The Authors, published by EDP Sciences, 2021
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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