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This Article Full Text Full Text (PDF) All Versions of this Article: 68/3/822    most recent biolreprod.102.009159v1 Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Parker, K.I. Articles by Macmillan, K.L. Search for Related Content PubMed PubMed Citation Articles by Parker, K.I. Articles by Macmillan, K.L. Agricola Articles by Parker, K.I. Articles by Macmillan, K.L.

Plasma Concentrations of Inhibin A and Follicle-Stimulating Hormone Differ Between Cows with Two or Three Waves of Ovarian Follicular Development in a Single Estrous Cycle¹

^a Department of Veterinary Science, University of Melbourne, Werribee, Victoria 3030, Australia ^b Prince Henry's Institute of Medical Research, Clayton, Victoria 3168, Australia ^c Oxford Brookes University, Oxford OX3 0P3, United Kingdom

Patterns of ovarian follicle development were monitored daily in Holstein-Friesian cows that had two (n = 4) or three (n = 4) waves of ovarian follicle development during a single estrous cycle. The plasma from daily blood samples was used in assays for inhibin A, FSH, progesterone, and estradiol-17ß. Mean cycle lengths for cows with two and three waves were 21.8 and 25.3 days, respectively (P < 0.02). Although the average number of follicles >3-mm diameter on each pair of ovaries was similar for two- and three-wave cows on Days 2, 3, and 4 (Day 0 = day of ovulation; 8.6 vs. 9.6 follicles), there were more follicles >6-mm diameter on the ovaries of cows with two waves on Days 3 and 4. This difference was associated with a shorter interval from wave emergence to peak concentrations of inhibin A during the first wave in two-wave cows (2.0 vs. 3.8 days; P = 0.03) and with higher peak concentrations (474 vs. 332 pg/ml; P = 0.03). Differences in peak FSH concentrations were not significant (1.7 vs. 1.3 ng/ml; P = 0.10) and were inversely related to inhibin A concentrations. The peak concentrations of inhibin A and FSH in the second nonovulatory wave in the three-wave cows were similar to the low concentrations measured in the first wave (292 vs. 332 pg/ml of inhibin A, 1.3 vs. 1.3 ng/ml of FSH; P > 0.20). Average peak concentrations of inhibin A and FSH were similar during the ovulatory wave for cows with either two or three waves in a cycle (432 vs. 464 pg/ml of inhibin A, 2.3 vs. 2.1 ng/ml of FSH; P > 0.3). The lower concentrations of FSH during the emergence of the first follicular wave in cows with three-wave cycles may have reduced the rate of development of some of the follicles and reduced the concentrations of inhibin A. This pattern of lower concentrations of FSH and inhibin A was repeated in the second nonovulatory wave but not in the ovulatory wave. Subtle differences in the concentrations of these two hormones may underlie the mechanism that influences the number of waves of ovarian follicle development that occur during the bovine estrous cycle.

¹ This study was funded by a Program Grant (#983212) from the NH&MRC of Australia, the Ethel and William Walters Memorial Scholarship and the Dairy Research and Development Corporation (UM 066).

² Correspondence: K.L. Macmillan, Department of Veterinary Science, University of Melbourne, 250 Princes Hwy., Werribee, VIC 3030, Australia. FAX: 61 3 9731 2388; e-mail: k.macmillan{at}unimelb.edu.au

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