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Circulating Concentrations of Estradiol, Luteinizing Hormone, and Follicle-Stimulating Hormone during Waves of Ovarian Follicular Development in Prepubertal Cattle¹

^a Department of Animal Science, University of Nebraska-Lincoln, Lincoln, Nebraska 68583-0908 ^b Roman L. Hruska Meat Animal Research Center, USDA, ARS, Clay Center, Nebraska 68933-0166

Objectives were to characterize changes in concentrations of LH, FSH, and estradiol-17ß (estradiol) in blood and populations of ovarian follicles of prepubertal cattle during waves of follicular development and to evaluate interactions between day after follicular aspiration and month prepuberty for these variables. During each month (month prepuberty), ovarian follicles of prepubertal cattle were aspirated to induce synchronous emergence of a wave of follicular development (day after follicular aspiration). Characteristics of ovarian follicular development and concentrations of hormones in blood were evaluated during the synchronous wave of follicular growth. Multiple regression was used to estimate hormonal variables and evaluate interactions for variables between day after follicular aspiration and month prepuberty. There were no interactions between day after follicular aspiration and month prepuberty for numbers of follicles 4 or > 5 mm or concentrations of LH, FSH, and estradiol. The pattern of change in these variables after follicular aspiration was, therefore, similar each month prepuberty. There were interactions between day after follicular aspiration and month prepuberty for frequency and amplitude of LH pulses and size of largest follicle. There were also endocrine changes that were related to follicular development after follicular aspiration throughout the peripubertal period.

¹ This work was supported by appropriated funds from the State of Nebraska and USDA CRGO NRI 93–37203–9068. Published as paper 11914, Nebraska Agricultural Research Division. Mention of a trade name, proprietary product, or specific equipment does not constitute a guarantee or warranty by the USDA and does not imply its approval to the exclusion of other products that may be suitable.

² Correspondence: James E. Kinder, A224j Animal Sciences, University of Nebraska, Lincoln, NE 68583–0908. FAX: 402 472 6362; ansc502{at}unlvm.unl.edu

³ Current address: Bowman Gray School of Medicine, Wake Forest University, Winston Salem, NC 27106.

⁴ Current address: INIFAP-SAGAR, C.E. Moccocha., Apdo. Postal 100 Suc., Merida, Yucatan, Mexico.

⁵ Current address: Building 263, Room 102A, BARC-East, 10300 Baltimore Avenue, Beltsville, MD 20705–2350.

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