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Related Experiment Videos

Corpus luteum function in ewes stimulated by rams.

T W Knight1, H R Tervit, R J Fairclough

  • 1Ministry of Agriculture and Fisheries, Research Division, Whatawhata Hill Country Research Station, Hamilton, New Zealand.

Theriogenology
|January 1, 1981
PubMed
Summary

Premature regression of corpora lutea (CL) in Romney ewes delays estrus after ram introduction. This CL dysfunction is a key factor in the observed dual estrus peaks, impacting sheep breeding efficiency.

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Area of Science:

  • Reproductive biology
  • Animal science
  • Veterinary medicine

Background:

  • Romney ewes often exhibit delayed estrus after ram introduction, affecting breeding programs.
  • Understanding the ovarian cycle and corpus luteum (CL) function is crucial for improving sheep fertility.

Purpose of the Study:

  • To investigate the incidence and impact of premature corpus luteum (CL) regression on estrus cyclicity in Romney ewes.
  • To determine the relationship between CL function and the interval to first estrus following ram introduction.

Main Methods:

  • Laparoscopic examination of ovaries and daily jugular blood sampling for progesterone assay in Romney ewes.
  • Monitoring ovulation and CL lifespan in ewes exposed to rams, with a control group.

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Main Results:

  • Eighty-five percent of laparoscoped ewes ovulated within 4 days of ram introduction.
  • Premature CL regression occurred in 8/20 ewes, leading to reduced progesterone levels.
  • Delayed estrus (23 days) was observed in ewes with premature CL regression compared to those without (19 days).

Conclusions:

  • Premature CL regression is a significant cause of delayed estrus in Romney ewes after ram introduction.
  • CL dysfunction contributes to the bimodal pattern of estrous activity observed in this sheep breed.