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Ovariectomized does do not require progesterone priming for oestrous behaviour.

S R Sutherland1, D R Lindsay

  • 1University of Western Australia, Nedlands.

Reproduction, Fertility, and Development
|January 1, 1991
PubMed
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Goats may not need progesterone priming to become sensitive to oestrogen for oestrus, unlike ewes. However, progesterone-primed ewes showed greater sensitivity to oestradiol benzoate (ODB) than goats.

Area of Science:

  • Reproductive biology
  • Comparative physiology
  • Animal science

Background:

  • Ewes require progesterone priming for oestrogen-induced oestrus.
  • The role of progesterone priming in oestrogen sensitivity in goats is less understood.
  • Seasonal influences on reproductive cycles are significant in livestock.

Purpose of the Study:

  • To investigate the necessity of progesterone priming for oestrogen-induced oestrus in goats.
  • To compare the oestrogen sensitivity of goats and ewes, with and without progesterone priming.
  • To explore potential seasonal effects on reproductive hormone sensitivity in these species.

Main Methods:

  • Experiment 1: Determined the median effective dose (MED) of oestradiol benzoate (ODB) to induce oestrus in progesterone-primed, ovariectomized goats during the breeding season.

Related Experiment Videos

  • Experiment 2: Compared the requirement for progesterone priming before ODB administration in ovariectomized goats and ewes in the early breeding season.
  • Measured oestrous responses to varying doses of ODB in both species under different hormonal treatments.

    • Main Results:

    • Progesterone-primed ovariectomized goats required a median effective dose of 15 micrograms of ODB to induce oestrus.
    • In the absence of progesterone priming, goats exhibited oestrus in response to 20-80 micrograms of ODB, while ewes did not.
    • Following progesterone priming, ewes (MED = 12 micrograms ODB) were more sensitive to ODB than goats (MED = 27 micrograms).

    Conclusions:

    • Goats may not require progesterone priming to exhibit oestrus at the onset of the breeding season, unlike ewes.
    • Differences in oestrogen sensitivity between goats and ewes may be influenced by seasonal factors or inherent species-specific variations.
    • These findings contribute to understanding species-specific reproductive endocrinology and hormonal treatments in small ruminants.