THE RELATIONSHIP CONTENT KEY STRESS HORMONES LIMITING INDICATORS OF FREE RADICAL OXIDATION OF BIOMOLECULES IN BLOOD OF COWS AT DIFFERENT STAGES OF THE REPRODUCTIVE CYCLE
The interrelation between the level of adrenocorticotropic hormone, cortisol, and pro- and antioxidant performance systems of blood obtained by enzymatic colorimetric method in cows in different stages of the reproductive cycle. Research carried out on cows aged 3 - 4 years at different stages of the reproductive cycle: 30 days after calving, 3rd, 5th, 7th, 8th months of pregnancy, 7-10 th day before calving, 10-15 days after calving. It was found that the concentration of serum adrenocorticotropic hormone cows in the first 2 months of pregnancy is constant, the 5th month of declines for 7-10 days before calving increases about 3 times, and 10-15 days after calving again decreases dramatically. Cortisol levels increased during the first seven months of pregnancy. The lowest values of serum prookislitelnoy ability cows observed in the period from the 5th to the 8th month of pregnancy, before the property has a tendency to increase. The highest antioxidant capacity observed in the blood of cows during the first 3 months of pregnancy, the 5th month takes its decline for the 8th month - an increase which, however, does not reach the target figures, to decline again predotelny period and the postpartum - increase.