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Influence of Prostaglandin F₂ on Spermatogenesis, Spermatozoal Output, Seminal Quality, Testosterone Levels and Libido of Yearling Beef Bulls^{1 ,2,}

Animal Reproduction Laboratory, Colorado State University, Fort Collins 80523

Abstract

Fourteen yearling Hereford or Angus bulls were given 30 mg prostaglandin F₂; (PGF₂) intramuscularly prior to the collection of semen on each of 2 days per week for 10 weeks. Effects of PGF₂ on spermatogenesis, spermatozoal output, seminal quality, libido and testosterone concentration in serum were assessed. Although the testosterone concentration in serum prepared from jugular blood increased approximately twofold after PGF₂, values for most other parameters did not differ due to PGF₂ treatment. Thus, we concluded that PGF₂, at this dosage and frequency of administration, did not alter the reproductive capacity of bulls.

¹ Prostaglandin F₂ was kindly supplied by the Upjohn Co., Kalamazoo, MI through Dr. J. W. Lauderdale.

² The technical support of E. W. Anderson, J. G. Berry, W. F. Dietz, E. R. Mateos, G. A. Ologun, L. S. Roesener, L. E. Tamlin, G. E. Todter and T. L. Walker is gratefully acknowledged. The authors also wish to extend thanks to Dr. T. J. Reimers for conducting the testosterone radioimmunoassays and to J. G. Goodwin for assistance with the statistical analyses.

³ Present address: Large Animal Clinic, College of Veterinary Medicine, Texas A&M Univ., College Station 77843.