Chechenikhina О.S.

DOI: 10.33284/2658-3135-103-3-165

UDC 636.088.5

Indicators of milk production of daughter cows depending on the highest milk yield of their mothers

Оlga S Chechenikhina

Ural State Agrarian University (Yekaterinburg, Russia)

Summary. The influence of the highest productivity of mother cows on milk yield and milk composition of black-and-white cows was studied. Groups of cows were formed by the method of balanced groups depending on the highest productivity of cows-mothers: the first group – milk yield for the highest lactation of cows-mothers 8000 kg of milk or less; the second group – from 8001 to 9000 kg; the third group – from 9001-10000 kg; the fourth group – from 10001 to 11000 kg; the fifth group – 11001 kg or more. Daughters whose mother did not finish lactation were not counted. It was found that the high level of mothers ' milk productivity during the period of the highest lactation (more than 11.000 kg of milk) enabled their daughters to become leaders already during the first lactation at P≤0.001. Productivity during the period of milking in cows-daughters of the fifth group is higher in comparison with the first, second, third and fourth groups, respectively. 242,0 (7,7%), 136,0 (4,4%), 142,0 (4,5%) and 39.0 kg (1.2%) for 305 days of lactation, the difference between the groups in this. During the entire period of economic use of animals, milk productivity had significant differences. Daughter cows with highly productive ancestors (more than 11.000 kg for maximum lactation) showed their highest productivity at the stage of 1.6 lactation, while their mothers at 3.1 lactation. The difference in this case was 1.5 lactation at P≤0.001. The milk yield of mother cows in the range from 8001 to 9000 kg of milk is repeated with maximum success in the offspring. The high level of milk productivity of daughters received from cows-mothers with the highest productivity for lactation of more than 11.000 kg of milk is associated with a reduction in their productive longevity by 0.2 lactation compared to the daughters of less productive ancestors.

Key words: cows, Black Spotted breed; cows-daughters; cows-mothers; lactation, milk yield for the highest lactation; repeatability of features.

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Chechenikhina Olga Sergeevna, Cand. Sci. (Agr.), Associate Professor, Department of Biotechnology and Food Products, Ural State Agrarian University, 620075, Ekaterinburg, Russia, 42 K. Liebknecht Street, tel.: 79122270251, e-mail: olgachech@yandex.ru

Received: 11 September 2020; Accepted: 14 September 2020; Published: 30 September 2020

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