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A note on the effect of continuous ram presence on estrus onset, estrus duration and ovulation time in estrus synchronized ewes

By J. E. Romano, D. Fernandez Abella, N. Villegas

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Abstract

During fall season, 18 multiparous Corriedale ewes were divided into two equal groups for the continuous (CON) and intermittent (INT) presence of a ram. Oestrus was synchronized with fluorgestone acetate intravaginal sponges (Chronogest) that were left 14 days, plus an injection of 200 micro g of a prostaglandin F-2 alpha analogue (Glandinex) at sponge removal. Oestrus was detected three times a day (at 06.00, 14.00 and 22.00 h) by using rams with harnessess and markers. Ovulation time was determined by laparoscopy, starting 24 h after oestrus detection. Oestrus onset was (mean+or-S.E.M.) 32.9+or-1.6 and 45.3+or-4.4 h for the CON and INT groups, respectively (P<0.01). Oestrus duration was 31.1+or-0.9 and 30.2+or-1.2 h, for the same groups, respectively (P>0.05). Ovulation time and the interval from sponge removal to ovulation (ISRO) for the CON and INT groups was 29.0+or-1.5, 62.0+or-2.0, 26.7+or-1.3 and 72.0+or-4.2 h, respectively. Ovulation time was not different (P>0.05), but ISRO was shown to be different between treatments (P<0.05). It is concluded that the continuous presence of a ram after sponge removal hastens oestrus onset and reduces the interval between sponge removal and ovulation, without modifying oestrus duration and time between oestrus onset and ovulation.

Date 2001
Publication Title Applied Animal Behaviour Science
Volume 73
Issue 3
Pages 193-198
ISBN/ISSN 0168-1591
DOI 10.1016/S0168-1591(01)00131-9
Language English
Author Address Large Animal Medicine & Surgery, College of Veterinary Medicine, Texas A&M University, College Station, TX 77843-4475, USA.
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Tags
  1. Animal reproduction
  2. Biotechnology
  3. Estrous cycle
  4. Mammals
  5. ovulation
  6. peer-reviewed
  7. Progestogens
  8. rams
  9. Ruminants
  10. Sexual behavior
  11. sexuality
  12. Sexual practices
  13. Sheep
  14. synchronization
  15. teasing
  16. Veterinary medicine
Badges
  1. peer-reviewed