[Endocrine status, ovulation frequency and embryo qualities in embryo donor-cows in superovulation period]
2006
Gavrichenko, N.V. | Medvedev, G.F.,Belarus State Academy of Agriculture, Gorki (Belarus)
At dairy cows in first half of sexual cycle (to the beginning of the standard term of polyovulation stimulation) a hormonal structure at animals various. It causes distinctions in received results. More stable and typical changes of the hormonal status at animals in the days previous extraction of germs, render beneficial effect on their quality. So, progesterone content on 4-7-th after insemination positively correlated days with number of germs excellent and high quality (г=0,25, P0,05) and is negative - with number of germs lagging behind in development (г=-0,48, Р 0,05). The size of factors of linear increase (regress) of progesterone content on days of research (from 0 till 10-th day) and oestradiol (from 0 till 6-th day), and also factors of cortizon decrease with 3-rd till 6-th day directly correlated with ovulation number and yellow bodies in ovaries, and also number of the taken germs (Р0,05). It was established that during the first part of reproductive cycle the changes in hormonal profile in different cows had no similarities, so when applying gonadotrophin there was the differences in the endocrine status and as a result, there was instability in ovulation number and qualities. Few doses of FSH in the beginning of the estrus cycle stimulated endocrine function of ovaries and other glands and led to improvement of ovulation frequency
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