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Sexual behaviour after treatment with prostaglandin-F<sub>2 alpha </sub>; in boars with suppressed concentrations of gonadal steroids

By M. J. Estienne, A. F. Harper, J. W. Knight, C. R. Barb, G. B. Rampacek

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Abstract

We tested the hypothesis that prostaglandin-F2 alpha (PGF2 alpha ) enhances sexual behaviour in boars with suppressed testosterone and estradiol secretion. After semen collection at week 0, boars received an s.c. implant containing a gonadotropin-releasing hormone agonist (GnRHa) or were sham-implanted. Beginning at week 1, GnRHa-implanted boars received i.m. treatment with 10 mg PGF2 alpha (n=5) or vehicle (n=5) upon entering the semen collection room. Sham-implanted boars (n=5) received i.m. vehicle. Blood was sampled and sexual behaviour assessed at weeks 0 and 5. Compared to sham-implanted boars and GnRHa-implanted boars receiving PGF2 alpha , serum concentrations of testosterone and estradiol were lower in GnRHa-implanted boars receiving saline (P<0.05). The number of boars ejaculating, time from entering collection room to the first attempt to mount the artificial sow, time from entering to the start of ejaculation, and duration of ejaculation did not differ among treatments (P>0.05). The number of false mounts (mounting artificial sow but dismounting prior to semen collection) was increased (P<0.05) by GnRHa implants, an effect reversed (P<0.05) by PGF2 alpha . The data indicates that acutely suppressing concentrations of testosterone and estradiol will not abolish sexual behaviour in boars, but leads to an increase in the number of unsuccessful mounts of an artificial sow. The number of false mounts can be decreased by treatment with PGF2 alpha .

Date 2004
Publication Title Applied Animal Behaviour Science
Volume 89
Issue 1/2
Pages 53-57
ISBN/ISSN 0168-1591
Language English
Author Address Department of Animal and Poultry Sciences, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, USA. mestienn@vt.edu
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Tags
  1. Animal behavior
  2. Animal husbandry
  3. Animal physiology
  4. Animal reproduction
  5. Blood
  6. Boars
  7. Endocrinology
  8. Estradiol
  9. GnRH
  10. Hormones
  11. Mammals
  12. Mating behavior
  13. peer-reviewed
  14. Sexual behavior
  15. sexuality
  16. Sexual practices
  17. steroids
  18. Swine
  19. testosterone
Badges
  1. peer-reviewed