MORPHO-CHEMISTRY BLOOD VALUES OF A COW DEPENDING ON LACTATION PERIOD
The purpose of the research is the morpho-chemistry blood value determination of high producing cows depending on the lactation period. The studies were carried out involving Holstein breed with a milk yield of 8500 kg or more. One group of cows-analogues was formed in regard to age, productivity and directional selection. Studies of blood chemical values were carried out during peak and end of lactation. Based on the conducted studies, it was found that milk productivity of cows, depending on the lactation period, affects blood values. During peak lactation of cows, the content of: erythrocytes by 1.06 1012/l, segmented neutrophils - by 3.80%, monocytes - by 1.06%, stab neutrophils - by 2.95%, hemoglobin - by 22.70 g/l, and in the blood serum: calcium by 0.16 mmol/l, glucose - by 0.48 mmol/l, total protein - by 18.23 g/l more than at the end of lactation. During the period of less intensive milk production and an increase of pregnancy period the content of platelets in blood is higher by 24.49 109/l, basophils - by 1.04%, in-organic phosphorus - by 0.16% compared to the lactation peak period. The ratio of the albumin-globulin coefficient was higher than the threshold level during the period of peak lactation by 0.24, and at the end of lactation by 0.45. An increase of albumin-globulin coefficient confirms a decrease of calcium content in the blood serum. The mor-pho-chemical blood values of cows, taking into account the lactation period, can serve as base for developing of feeding technology, keeping high producing cows to prevent metabolic disorders by the end of lactation and correction during the dry period.