J. Anim Sci.
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J. Anim Sci. 1974. 38:81-85.
© 1974 American Society of Animal Science
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Effect of Testosterone on Reproductive Characteristics of Puberal Gilts1

Ciro A. A. Torres2 and N. L. First3

University of Wisconsin,4, Madison 53706

Abstract

Ninety crossbred gilts were allotted to four levels of testosterone treatment, 0, 50, 100 and 200 mg, treated for 10-day intervals at days 3 to 12, 9 to 18 and 15 to 24 of the estrous cycle and slaughtered at the end of treatment or at day 25.

Testosterone injected in the early and middle of the luteal phase of the estrous cycle blocked ovulation, but did not at the end. The treated gilts were in estrus longer (4.0 to 6.8 days) than control gilts (1.8 days). The number of follicles 7 to 10 mm and greater than 10 mm (cystic follicles) were increased from a mean of zero in the control group up to a mean of 8.4 and 12, respectively, in the treated gilts. The number of ovarian structures (follicles greater than 1.0 mm plus new corpora lutea) was decreased in the treated gilts. Testosterone treatment failed to affect the lifespan of the corpora lutea. An intensification of sexual behavior was observed in most of the treated gilts. The animals usually showed mounting activity until exhaustion.

Footnotes

1 Research supported by the College of Agricultural and Life Sciences, University of Wisconsin, Madison, 53706 and by Geigy Agricultural Company.

2 Permanent address: Departamento de Zootecnia. Universidade Federal de Viçosa-Viçosa-Minas Gerais-Brasil, USAID Contract AID/LA-639.

3 The advice of L. E. Casida is gratefully acknowledged.

4 Department of Meat and Animal Science Paper No. 623.






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