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Journal of Animal Science, Vol 68, Issue 3 719-724, Copyright © 1990 by American Society of Animal Science

JOURNAL ARTICLE

Number of mature follicles ovulating after a challenge of human chorionic gonadotropin in different breeds of sheep at different physiological stages

M. A. Driancourt, L. Bodin, O. Boomarov, J. Thimonier and J. M. Elsen
Institut National de la Recherche Agronomique, Nouzilly, France.

The ovulatory response of ewes from breeds that differ widely in prolificacy (Ile-de-France, ++ Booroola Merino, Romanov, F+ Booroola Merino and F+ Booroola Romanov with adult ovulation rates of about 1.5, 1.2, 3, 3 and 3.5 respectively) to 750 IU of hCG given at different physiological stages (before puberty, during anestrus or during the luteal phase) was compared. In all except one experiment, hCG induced ovulation in 73 to 98% of the lambs, indicating that follicles sensitive to LH were present at all stages studied. Ranking of the breeds according to hCG-induced ovulation rate in prepuberal lambs was similar to that based on adult ovulation rate. Furthermore, hCG induced more ovulations in prepuberal F+ than in ++ lambs (3.7 +/- 1.4 vs 1.7 +/- .8 at 4.5 mo of age) as well as in anestrous ewes (F + at 3.1 +/- 1.8 vs ++ at 1.6 +/- .7). Within ewes, the correlation between hCG-induced ovulation rate and mature ovulation rate was positive in nonprolific breeds but not significant in prolific breeds. We conclude that 1) the number of hCG-induced ovulations can be used to identify sheep that are carriers of the Booroola gene and 2) the mechanisms responsible for a number of large ovulatory follicles typical of a breed are present at stages (prepuberal, anestrus, luteal phase) other than the follicular phase.


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D. Monniaux, P. Monget, C. Pisselet, J. Fontaine, and J.M. Elsen
Consequences of the Presence of the Booroola F Gene on the Intraovarian Insulin-Like Growth Factor System and Terminal Follicular Maturation in Merinos d'Arles Ewes
Biol Reprod, October 1, 2000; 63(4): 1205 - 1213.
[Abstract] [Full Text]


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Copyright © 1990 by the American Society of Animal Science.