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Dairy productivity of Yenisei red-motley cows as a function of growth rate and age of fertile insemination
Author(s) -
А И Голубков,
Л. В. Ефимова,
А. А. Голубков
Publication year - 2022
Publication title -
vestnik novosibirskogo gosudarstvennogo agrarnogo universiteta
Language(s) - English
Resource type - Journals
ISSN - 2072-6724
DOI - 10.31677/2072-6724-2021-61-4-100-107
Subject(s) - insemination , ice calving , breed , biology , zoology , motley , lactation , artificial insemination , productivity , population , birth weight , pregnancy , demography , linguistics , philosophy , genetics , macroeconomics , sociology , economics
The main task in dairy farming is the proper breeding of heifers to realise their genetic potential further. The research aims to study the impact of the growth rate of heifers and heifers of Yenisei type of red-motley breed on their subsequent dairy productivity. The research was conducted in the breeding plant of Solgon JSC of the Uzhur district, Krasnoyarsk Territory. The heifer population (1156 heifers) was divided into eight groups according to the age of fertile insemination. The first three groups were fast-growing animals (10-14 months of fertile insemination), the remaining five groups were slow-growing animals (15 months of fertile insemination or older). The authors chose the following indicators to study: live weight, average daily live weight gain, age of first successful insemination and first calving, and milk productivity of cows in 305 days of the first lactation. Fast-growing heifers were found to outperform slow-growing heifers in terms of growth rate. The live weight of fast-growing heifers was 102 grams greater, or 11.6% than that of slow-growing heifers from birth to first fertile insemination. The live weight of fast-growing heifers was 83 grams or 11.3%, more outstanding from birth to first calving. A comparative analysis of the milk production of fast- and slow-growing animals showed no significant difference between the groups on average. However, the difference in milk yield and milk fat and protein between the individual groups was statistically significant. Studies have confirmed that heifers of the Yenisei type can be inseminated quite successfully at an earlier age (12-14 months). Heifers of this type enter the production group more quickly and cost less to raise (by 4,742 roubles or 11.9%), which has an impact on profit (by 5,844 roubles or 30.2%) and profitability levels (by four percentage points or 40%).

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