J. Anim Sci.
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J. Anim Sci. 1972. 34:614-619.
© 1972 American Society of Animal Science
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LH Release and Ovulation in the Prepuberal Lamb1

E. L. Squires2, R. J. Scaramuzzi3, B. V. Caldwell4 and E. K. Inskeep

West Virginia University, Morgantown 26506 and Worcester Foundation for Experimental Biology, Shrewsbury 01545

Abstract

Attainment of puberty in ewe lambs is a function of season of birth, breed, age and weight (Hulet, 1968). Foote, Sefidbakht and Madsen (1970) found that the first ovulation in ewe lambs was very seldom accompanied by estrus, however, the hormonal changes responsible for the first ovulation and first estrus are not well documented. A higher gonadotropic potency of the pituitary before puberty with a decrease at puberty has been demonstrated by Mansour (1959).

Estrogen has been implicated in the ovulatory release of luteinizing hormone (LH) in mature ewes (Goding et al., 1969; Piper and Foote, 1968), a response which was prevented by concomitant injection of progesterone or by immunization against estradiol-17ß in ovariectomized ewes (Scaramuzzi et al., 1971; Caldwell et al., 1970). Pretreatment with estradiol-17ß enhanced the occurrence of estrus and ovulation in ewe lambs in response to progestin and pregnant mares serum gonadotropin (PMS) treatments (Bennett and Foote, 1968; Foote and Matthews, 1969; Burfening and Van Horn, 1970).

Footnotes

1 Published with the approval of the Director of the West Virginia Agricultural Experiment Station as Scientific Paper No. 1186.

2 Present address, Department of Veterinary Science, University of Wisconsin, Madison 53706.

3 Present address, Department of Anatomy, UCLA School of Medicine, Los Angeles, California 90024.

4 Present address, Department of Obstetrics and Gynecology, Yale University, New Haven, Connecticut.






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