Ontogenesis Intensity and Milk Productivity of Holstein First-Calving Cows
- Authors: Skakunova K.A.1, Grachev V.S.1, Braginets S.A.1
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Affiliations:
- Saint-Petersburg State Agrarian University
- Issue: No 1(75) (2024)
- Pages: 87-94
- Section: Animal science and veterinary medicine
- URL: https://bakhtiniada.ru/2078-1318/article/view/304755
- DOI: https://doi.org/10.24412/2078-1318-2024-1-87-94
- ID: 304755
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Abstract
The article deals with the indicators of ontogenesis of dairy heifers at different age periods expressed in live weight, analyses the measurements of first-calf heifers and their milk productivity indicators. The research includes data on 1571 animals of Holstein breed in one of the outstanding modern farms - breeding plant 'Detskoselsky'. It is found that the live weight of heifers at different ages is quite equalized (coefficients of variability are at the level of 3,68-7,54%). The analysis of the main measurements of the first heifers shows that all animals are large enough, the variability of measurements is not high (2,87-3,85%). Breast girth was the least variable. Analyses of the relationship between live weight at different ages and milk yield in the first lactation showed that in general it is practically absent. Only a rather weak positive relationship (0,19) between live weight in the first lactation and milk yield was found. This indicates that more massive first heifers showed maximum milk yields, but this relationship was obviously curvilinear. The relationship between milk yield and measurements was more significant. Thus, the correlation coefficient of milk yield with oblique torso length was 0,25, and with torso girth 0,17. Accordingly, animals with a longer torso and slightly more massive animals showed maximum milk yields. Correlation coefficients between live weight at different ages (except live weight at birth) and age of first insemination were the most significant. Heifers inseminated earlier than others maintained high intensity of ontogenesis in all age periods. This makes it possible to select them for early maturity, starting from six months of age.
About the authors
K. A. Skakunova
Saint-Petersburg State Agrarian University
Email: skakunova-kristina@mail.ru
Postgraduate student of the Department of Genetics, Breeding and Biotechnology of Animals
Pushkin, Saint Petersburg, RussiaV. S. Grachev
Saint-Petersburg State Agrarian University
Email: grachev_vadim@mail.ru
Cand. Sci. (Biol.), Associate Professor of the Department of Genetics, Breeding and Biotechnology of Animals
Pushkin, Saint Petersburg, RussiaS. A. Braginets
Saint-Petersburg State Agrarian University
Author for correspondence.
Email: braginetssvetlana@gmail.com
Cand. Sci. (Biol.), Associate Professor, Head of the Department of Animal Genetics, Breeding and Biotechnology of Animals
Pushkin, Saint Petersburg, RussiaReferences
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