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The effect of exposure to oestrous ewes on rams' sexual behaviour, plasma testosterone concentration and ability to stimulate ovulation in seasonally anoestrous ewes

By H. J. D. Rosa, D. T. Juniper, M. J. Bryant

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Abstract

272 ewes were introduced to (1) rams without recent experience of oestrous ewes, (2) rams recently exposed to oestrous ewes, (3) and (4) oestrous ewes and rams with or without recent experience with oestrous ewes, or (5) remained isolated from rams. Serum testosterone concentration of rams was increased (P<0.05) equally when oestrous or anoestrous ewes were introduced. Exposure to oestrous ewes before or after introduction increased (P<0.05) the various measures of ram sexual behaviour directed towards anoestrous ewes. However, there was no statistical evidence that increased sexual activity resulted in an improvement in the ability of rams to stimulate ovulation in anoestrous ewes.

Date 2000
Publication Title Applied Animal Behaviour Science
Volume 67
Issue 4
Pages 293-305
ISBN/ISSN 0168-1591
DOI 10.1016/S0168-1591(00)00086-1
Language English
Author Address Department of Agriculture, The University of Reading, Whiteknights, P.O. Box, Reading RG6 6AT, UK.
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Tags
  1. Anestrus
  2. Animal behavior
  3. Animal physiology
  4. Animal reproduction
  5. Behavior and behavior mechanisms
  6. Estrous cycle
  7. Females
  8. Hormones
  9. Libido
  10. Mammals
  11. ovulation
  12. peer-reviewed
  13. pheromones
  14. rams
  15. Ruminants
  16. Sexual behavior
  17. sexuality
  18. Sexual practices
  19. Sheep
  20. testosterone
Badges
  1. peer-reviewed