Ultrasonic findings in the ovaries and the associated concentrations of plasma progesterone in Japanese black cows transfered with frozen-thawed embryos
1994
Kamimura, S. (Kagoshima Univ. (Japan). Faculty of Agriculture) | Ono, M. | Sameshima, H. | Enomoto, S. | Hamana, K. | Goto, K. | Yanagita, K.
In the Japanese black cows transferred with frozen-thawed embryos, a few ultrasonic findings made on the ovaries, and the associated concentrations of plasma progesterone were determined after examinations, and the obtained results were compared between the pregnant cows and the non pregnant ones. The estrous cycles of the 34 Japanese black cows were synchronized with the prostaglandin F2 alpha injections executed 2 times. And 29 cows showed estrus, and those were subjected to the embryo-transfer on the seventh day (day 0 = estrus). On the 34th day 12 cows were diagnosed by ultrasonography to be pregnant (12/29 41.4%), whereas on the 41st day only 9 cows were fixed to be pregnant steadily (9/29 = 31.0%). In between the 34th day and the 41st day early embryonic deaths were suspected in 3 cows. On the embryo-transfer day, between pregnant cows and non pregnant ones no difference was noted in the concentrations of plasma progesterone. In the ultrasonic findings made on ovaries on the 20th day, or the second estrous day, in the pregnant cows there was a revelation of a larger diameter of corpus luteum (not significant), and higher concentrations of progesterone (significant) than those in non pregnant cows. Although the largest sized follicle with the diameters = 15mm tended to be increasing during the estrous period, the number of follicles characterized with their diameters varied without any significance, depending on the progression of the estrous cycle. There was no significant difference noted in the number of follicles between the pregnant cows and the non pregnant ones
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