Relationship between cows reproduction function and blood β-hydroxybutyrate

The aim of this master thesis is evaluate relationship between cows reproduction function and blood β-hydroxybutyrate. The research was carried out in the farm ‚“X” in the district of Kėdainiai. For the study were selected 32 cows. Selected cows were divided into test and control groups by blood BHB concentration. In the study group are 16 cows with blood BHB concentration higher than 1 mmol/l. In the control cows group are 16 cows with blood BHB concentration lower than 1 mmol/l. For the research selected cows are second and higher lactation, they didn„t have any postparturient diseases up to 10 days pp. At 10 days pp we measured blood glucose and BHB concentration from peripherial blood. At 10 and 30 pp with IMAGO lineal ultrasound we measured both ovaries diameter, structures of the ovaries, lactation peak, date of lactation peak, activity. From herd data analysis system evaluate date of the first estrus. Groups of test cows had average 57 % higher concentration of blood BHB, 13 % lower concentration of blood glucose and 20 % lover activity to compare with control group at 10 pp. BHB concentration between test group cows were 31 % higher, blood glucose concentration 8 % lower and activity 5.2 % lower at 30 pp. Lactation peak of the control group 48,4 kg to compare with test cows group 46,6 kg. Control group had 5.5 % lower average lactation peak. Average date of test cows group lactation peak reached 9 % earlear and was 5.5 % lower. Test cows group had average 7 % smaller diameter of the left ovary at 10 pp. And average 1 % bigger diameter of the left ovary at 30 pp. Test cows group had average 12,3 % bigger diameter of the right ovary to compare with control cows group at 10 pp. And 9 % bigger diameter of the right ovary at 30 pp. Test cows group had average 9 % smaller follicles in in the ovaries at 10 pp. Test cows average had 3 % smaller follicles at 30 pp. (p