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EN
The studies aimed to evaluate the influence of differentiated dried cows feeding on their health and futher milk yield, and on health of their offspring. The experiment was carried out on 37 cows of Black and White breed randomly divided into 5 feeding groups, in which were applied diets of restricted amounts of grass silage and potato pulp and straw ad libitum. The diets were completed with small amounts of concentrate or dried forage. Crude total protein in dry matter of diet, except of the second group-II (14,3%) did not ecceed 11,8%. As a result of the carried out studies there was stated thet aconomical feeding dried cows of milk production to 25 kg of milk daily after calving, did not influence negativaly cows and calves health and calves body weights at births and their futher development. Protein, glucose and macro- and microelements contents in blood serum are contained in limits of physiological norms. However levels of beta carotene and vitamin A were found in blood serum of cows and calves, colostrum and milk. The studies should be continued on cows of milk daily yield above 25 kg.
EN
To conduct the study two experiments were performed. In the first one the level of oestrone sulphate (EiS) and oestrone (Ei) was determined in the peripheral blood during the last two weeks before parturition. The mean Ei level was increasing progressively until the end of pregnancy. In contrast, the EiS values were at that time constant. However, just before parturition the concentration of EiS (15-18 ng per 1 ml) was 5-fold higher than that of Ei (3.0-3.5 ng per 1 ml). In the second experiment the level of the steroid hormones was measured in the uterine (umbilical vessels) circulation. The highest levels of EiS (approx. 35 ng per 1 ml) were found in the foetal blood (umbilical vein), while the highest concentration of Ei (approx. 8 ng per 1 ml) was in the uterine circulation (uterine vein). The data obtained suggest that placental oestrogens are primarily produced in the conjugated form (EiS) by the foetal part of the placenta; in the maternal placenta they are converted into unconjugated oestrogens form, in the perinatal period has been discussed.
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