Comparative evaluation of the dynamics of the main indicators of metabolism in cows with different milk productivity

This article examines the results of a comparative study of metabolic processes in cows with low and high milk productivity. The concentration of total protein, urea, creatinine, glucose and cholesterol in the blood serum of cows was studied during periods of dryness, after calving and lactation. Formation of groups of cows was carried out according to the results of previous lactation. The observation showed that in the current lactation the level of productivity in the cows studied was preserved. Within four months after calving, intergroup differences in milk yields were 24, 1 - 36, 8%. The study of the dynamics of various metabolic parameters in cows revealed both stable home metabolites and homeostatic metabolites, which depend on the physiological phase and on the level of milk productivity. The absence of pronounced intergroup fluctuations was noted in relation to total protein, glucose and creatinine. Similar dynamics of urea levels in cows of both groups is established. So, after calving the indicator decreases, then it increases. During the height of lactation in highly productive cows, the urea level is 19.2% higher. There is a progressive increase in cholesterol in both groups with a significant increase within each group compared with the dry period. The maximum values during the height of lactation are higher than the initial values by 2.4 times in low-productivity and 3.0 times in highly productive cows. In highly productive cows at the end of the observation period, the cholesterol level is higher by 18.6%.

коровы, метаболизм, молочная продуктивность, биохимические показатели, сыворотка крови, cows, metabolism, milk productivity, biochemical parameters, blood serum

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