Follicular Deviation and Acquisition of Ovulatory Capacity in Bovine Follicles1

排卵 卵泡期 毛囊 生物 内分泌学 内科学 卵泡 动物科学 促黄体激素 男科 激素 医学
作者
Roberto Sartori,P.M. Fricke,João Carlos Pinheiro Ferreira,O.J. Ginther,Milo C. Wiltbank
出处
期刊:Biology of Reproduction [Oxford University Press]
卷期号:65 (5): 1403-1409 被引量:435
标识
DOI:10.1095/biolreprod65.5.1403
摘要

Selection of dominant follicles in cattle is associated with a deviation in growth rate between the dominant and largest subordinate follicle of a wave (diameter deviation). To determine whether acquisition of ovulatory capacity is temporally associated with diameter deviation, cows were challenged with purified LH at known times after a GnRH-induced LH surge (experiment 1) or at known follicular diameters (experiments 2 and 3). A 4-mg dose of LH induced ovulation in all cows when the largest follicle was ≥12 mm (16 of 16), in 17% (1 of 6) when it was 11 mm, and no ovulation when it was ≤10 mm (0 of 19). To determine the effect of LH dose on ovulatory capacity, follicular dynamics were monitored every 12 h, and cows received either 4 or 24 mg of LH when the largest follicle first achieved 10 mm in diameter (experiment 2). The proportion of cows ovulating was greater (P < 0.05) for the 24-mg (9 of 13; 69.2%) compared with the 4-mg (1 of 13; 7.7%) LH dose. To determine the effect of a higher LH dose on follicles near diameter deviation, follicular dynamics were monitored every 8 h, and cows received 40 mg of LH when the largest follicle first achieved 7.0, 8.5, or 10.0 mm (experiment 3). No cows with a follicle of 7 mm (0 of 9) or 8.5 mm (0 of 9) ovulated, compared with 80% (8 of 10) of cows with 10-mm follicles. Thus, follicles acquired ovulatory capacity at about 10 mm, corresponding to about 1 day after the start of follicular deviation, but they required a greater LH dose to induce ovulation compared with larger follicles. We speculate that acquisition of ovulatory capacity may involve an increased expression of LH receptors on granulosa cells of the dominant follicle and that this change may also be important for further growth of the dominant follicle.
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