Abstract
Studies of the feed rations of cows during the stall period at «Olzha Agro» LLP showed deviations from the established norms. The content of protein feed is overestimated by 4%. Deviations in the content of macro-microelements in the diet were noted: calcium, zinc, copper, manganese, which is manifested by a decrease in sex hormones. The excessive content of phosphorus and iron (in the range of 39.88-95.7%) is due to deterioration in the absorption of manganese. The concentration of magnesium in the blood serum of the studied cows is 43% lower than normal. This affects the digestibility of calcium and phosphorus. The concentration of total protein in the blood serum is 30.71% higher than normal. The albumin content does not exceed 75 g/L. Urea and glucose concentrations are normal. ASat and ALat indicators indicate liver tension. This is clinically confirmed by the presence of ketosis in 3.4% and acidosis in 76.3% of cows. The number of somatic cells in 95% of cows indicates the absence of mastitis. The ratio of protein and fat in milk is diagnostic in nature. An increase in the ratio to 1 indicates acidosis, with a ratio close to 0.6 indicating ketosis. Deviations from established standards have been identified in feed rations, which are the direct cause of decreased fertility of dairy cows and their reproductive health.
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