Endocrinological observation and morphology of the corpus luteurn and large follicles of bovine ovaries in early diestrus
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概要
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One hundred fourty nine bovine ovaries were obtained on day 5-9 after estrous at local slaughterhouse. The significant high level appearance of corpora lutea of 21-25 mm size in diameter and coexisting follicles of 11-15 mm size in diameter was recorded. The relationship between the form of oocyte obtained by aspiration and corpora lutea whose diameter being 16-30 mm was examined and it was demonstrated that about 60% of aspiratory oocytes proved to be degenerated.<BR>As for the concentration of Progesteron (P<SUB>4</SUB>) and Estradiol 17 β(E<SUB>2</SUB>) of 23 follicle fluid samples of coexisting follicles, 16 coexisting follicles (69.6%) were found to be P<SUB>4</SUB>-dominated follicles. In the morphological observations of granulosa cells of 23 follicular walls, 7 were deficient in granulosa cells, and as for the other 16 follicular walls, 15 were found to be atretic or in the way of luteinization.<BR>The observation of granulosa cell by TEM, revealed the appearance of many fat drops in the cytoplasm of coexisting follicles, suggesting the initiation of luteinization process.<BR>From the results, when embryo transfer or flushing of in vivo bovine embryo will be performed at day 7 of the estrous cycle, the follicles coexisting with functional corpus luteum, whose diameter being larger than 10 mm, were dominated by P<SUB>4</SUB>, and they become to be atretic or luterizing follicles. It suggests that the coexisting follicles do not effect on the conception or development of the embryos.
- 日本哺乳動物卵子学会の論文
日本哺乳動物卵子学会 | 論文
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