| Popis: |
The decrease in fertility of highly productive dairy cows associated with postpartum ovarian depression is becoming one of the significant problems of modern dairy cattle breeding. The aim of this study was to identify and assess the state of protein, carbohydrate and lipid metabolism in Holstein-Friesian cows in the dynamics of postpartum period with the restoration and depression of ovarian ovulatory function against the background of their adequate feeding. The experiment included 16 fresh cows with an average annual dairy productivity of 9.5 ths kg. The blood for the study was obtained from the caudal vein on the 6th, 12th, 40th and 68th days after calving. Blood serum content of total protein and its fractions, urea, creatinine, total lipids, cholesterol, triglycerides and glucose was determined. The state of genitals was evaluated by transrectal palpation and ultrasound scanning, as well as by blood concentration of progesterone and estradiol. It has been shown that the formation of postpartum ovarian dysfunction in cows occurs against the background of low blood content of glucose, globulin protein fractions and increased creatinine content. The threshold serum concentration of glucose during the first two weeks after calving, at which ovarian dysfunction and a decrease in animal fertility should be predicted, is less than 2,2 mmol/L. There was expressed a judgment on the appropriateness of further researches to identify the relationship of the metabolic status of animals with the typological features of their higher nervous activity. |
