Assessment of the physiological state of lactating cows of different ages

We have studied of the physiological state of lactating cows of different ages was carried out. In the diet of animals, an excess of crude protein, crude fat and a lack of dry matter, crude fiber, sugar, phosphorus were found in comparison with the normative data. In young cows, a violation of fat metabolism and a decrease in immunological reactivity were recorded. In animals aged 3-6 lactation, the development of metabolic alkalosis and hepatosis, a decrease in the hemoglobin content in the blood, the occurrence of endogenous intoxication and a decrease in nonspecific resistance of the body were observed.