Agrarian Science and Food Technologies

Сandidate of Аgricultural Science, Associate Professor

Vinnitsia National Agrarian University

The impact of birth season on milk productivity in the cows of the Ukrainian black-speckled dairy breed of the first, second, third, fourth and fifth lactations born in winter, spring, summer and autumn was investigated. All the cows were kept at the same level, type of feeding, diets and conditions.

The studies have determined that the highest milk yields per lactation were found in the cows born in autumn (3398.5-4354.3 kg (P<0.05-0.001)). Depending on lactation, they were the lowest in the cows born in spring and summer. The coefficient of variability in milk yield was 24.6-28.6% (high variability of the characteristic), in fat content – 5.4-5.8% (average variability of the characteristic) and in the amount of milk fat – 24.9-29.9% (high variability). Analyzing the correlation coefficient between cows’ milk productivity with the birth season, it was found that the correlation between milk yield, milk fat content and the amount of milk fat content was poor (0.01-0.07), though it was direct (positive) for all lactations.

The impact of the cows’ birth season on their milk productivity was negligible. Depending on lactation, it was 0.12-0.36% on milk yield, 0.11-0.39% on milk fat content and 0.12-0.38% on the amount of milk fat content. Therefore, the impact of birth season may not affect the cow’s future milk productivity, but the latter will depend on the feeding and keeping conditions for young animals. Taking into account the results of these studies, it is proposed to plan the birth of young in autumn and winter.

The calculation of the economic evaluation of cows’ milk productivity, depending on the birth season, showed that the highest yield per cow could be obtained from the animals born in autumn. This figure exceeded the income from the animals born in winter by 5.3%, in spring – by 4.7%, in summer – by 7.6%, respectively.

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