The cows-mothers, culling age and its relation to productive longevity and reproductive qualities of daughters

Summary. The article shows the influence analysis results of cow-mothers' culling age on the cow-daughters' productive longevity and reproductive ability. The influence of cows' culling age on the cow-daughters' age at first calving and the mothers' insignificant influence on economic use period and lifetime milk yield of daughters has been established. The research results can be recommended for use in breeding work with RedMottley breed cows.

Introduction. Increasing the cows' productive longevity and improving their reproductive ability is one of the important tasks in dairy cattle breeding in our country. Long-term operation of cows allows for more efficient breeding work with cattle and contributes to improving the industry's efficiency as a whole. In the Krasnoyarsk Territory, the cows' average culling age is 3.3 calving, but their highest productivity is usually manifested only in 4-6 lactation.

Object. The research object was Red-Mottley breed cows.

Materials and methods. To conduct research in CJSC "Nazarovskoye" of the Krasnoyarsk Territory, a database with using the Selex program was formed. The statistical processing included data from 2,199 cows that dropped out of the herd from 2017 to 2022 at age of the first completed lactation and older. The cows were divided into groups depending on the culling age of their cow-mothers.

Results and conclusions. It was discovered that the cows received from mothers who had the culling age of 5.3-7.2 years were characterized by the highest milk yield and the longest of economic use period. Cows received from mothers who had the culling age of 7.3 years and older had the lowest age at first calving. Reliable positive associations of weak strength were found in groups I and III between the cow-mothers' culling age and such indicators as duration of economic use of daughters (r = 0.08 ...0.11; P>0.95...0.99), lifetime milk yield (r = 0.09...0.11; P>0.99), life expectancy (r = 0.08...0.10; P>0.95) and number of lactation (r = 0.07 ...0.11; P>0.95...0.99).

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