Biochemical indices of the functional state of the liver during the dry period and the first trimester of lactation in Black-and-White cows with different postpartum ovarian activities

Objective : to study the biochemical indices of the functional state of the liver during the dry and postpartum periods in Black-and-White cows s in relation to the dynamics of ovarian luteal activity resumption. Materials and methods . The study included 69 cows in their second to fourth lactation periods, from which blood samples were taken 6, 4, and 2 weeks before calving and 1, 3, 7, and 13 weeks after calving. The functional state of the ovaries was assessed 7 and 13 weeks after calving using rectal and ultrasound examinations. The ovarian luteal activity was assessed based on the blood progesterone levels. The cows were divided into 4 groups: I – luteal activity was diagnosed by the 7th week postpartum (n=29); II – luteal activity was detected by the 13th week postpartum (n=16), III – luteal activity was not detected within 13 weeks after calving in the absence of signs of ovarian hypofunction (n=12), IV – the presence of signs of moderate or severe ovarian hypofunction (n=12). Results . Throughout the observation period, albumin concentrations in the blood of cows in Group IV were 1,1— 1,2 times lower (p