To study the anabolic aspects of lactation in cows in connection with the intensity of ketogenesis in the new body period
https://doi.org/10.52419/issn2072-2419.2023.4.447
Abstract
The article discusses the results of a study of the milk productivity of cows in connection with the content of beta-hydroxybutyric acid in the blood during the new calving period. The studies were carried out on highly productive full-aged cows of the second and third lactation. The animals were divided into three groups according to the content of beta-hydroxybutyrate - up to 1.0 mmol/l; from 1.0 to 2.0 mmol/l and over 2.0 mmol/l. It has been established that an increase in the content of ketones in the blood is associated with hypoglycemia. Cows with increased levels of beta-hydroxybutyric acid at the beginning of lactation showed higher daily milk yields over a five-month period of observation. In the fourth and fifth months of lactation, the milk yield of these cows was higher than in groups 1 and 2 by 14.6-15.8% and 18.5-20.1%, respectively. In addition, the total yield of fat in this group is greater than in the first and second - by 12.8% and 10.7%, protein - by 9.7% and 11.2%, and lactose - by 8.5% and 13.5%, respectively. A calculation indicator was proposed - the lactation anabolism index, which is calculated using daily milk yield, mass fraction of milk protein and urea concentration. An increase in this index indicates the activation of anabolic reactions, a decrease indicates a surge in catabolic processes. An increase in the lactation anabolism index was found in cows of the third group at 4-5 months of lactation with a significant increase of 44.8-45.8% in comparison with groups 1 and 2. A high metabolic potential for further productive lactation was established in cows that had increased concentration of beta-hydroxybutyric acid in the new calving period.
About the Author
S. V. Vasileva
St. Petersburg State University of Veterinary Medicine
Russian Federation
Russian Federation
Candidate of Veteriary Sciences, Associate Professor of the Department of Biochemistry and Physiology
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Review
For citations:
Vasileva S.V. To study the anabolic aspects of lactation in cows in connection with the intensity of ketogenesis in the new body period. International Journal of Veterinary Medicine. 2023;(4):447-456. (In Russ.) https://doi.org/10.52419/issn2072-2419.2023.4.447
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