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A note on the effect of individual housing conditions on LH secretion in ewes after exposure to a ram

By J. A. Abecia, F. Forcada, O. Zuniga

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Abstract

To determine whether it is feasible to use the stimulus of exposure to a ram to induce sexual activity in individually housed ewes, 33 adult anoestrous ewes were randomly allocated to two treatments: Group 1, n=20, housed in individual pens, with a ram's pen situated between every two ewes (exposed to rams through the pen's bars) and Group 2, n=13, housed in a communal pen with five rams (full contact with the rams). The day before the introduction of rams, blood samples were collected from Group 1 ewes, for 6 h at 15 min intervals commencing 10:00 h. Rams were introduced in both groups the following day at 8:00 h. Two hours later, blood samples were collected from Group 1 ewes for 6 h at 15 min intervals. Thereafter, ewes and rams were moved to a communal pen and blood samples collected every 3 h until 10:00 h the next day. In Group 2, blood samples were collected every 3 h for 24 h starting at 10:00 h, 2 h after the rams were introduced. From the samples collected at 15 min intervals, no differences between mean LH concentrations, pulse frequencies and amplitudes before or after the introduction of rams were observed in Group 1. The percentage of ewes presenting a pre-ovulatory surge of LH in the first 24 h after the introduction of rams was similar in both groups (Group 1: 50

Date 2002
Publication Title Applied Animal Behaviour Science
Volume 75
Issue 4
Pages 347-352
ISBN/ISSN 0168-1591
DOI 10.1016/S0168-1591(01)00202-7
Language English
Author Address Departamento de Produccion, Animal y Ciencia de los Alimentos, Facultad de Veterinaria, Miguel Servet 177, 50013 Zaragoza, Spain. alf@posta.unizar.es
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Tags
  1. Animal behavior
  2. Animal housing
  3. Animal physiology
  4. Behavior and behavior mechanisms
  5. Estrous cycle
  6. Mammals
  7. peer-reviewed
  8. rams
  9. Ruminants
  10. Sexual behavior
  11. sexuality
  12. Sexual practices
  13. Sheep
Badges
  1. peer-reviewed