J. Anim Sci.
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J. Anim Sci. 1944. 3:12-21.
© 1944 American Society of Animal Science
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Potential Fertility of Ova from Ewes Treated with Gonadotropins1

R. L. Murphree, E. J. Warwick, L. E. Casida and W. H. McShan

Departments of Genetics and Zoology, University of Wisconsin

Abstract

Twenty-four "follicular" ewes (12 days after beginning of estrus) treated with follicle-stimulating extracts had a total of 576 corpora lutea and yielded 357 eggs. Seven animals had no fertilized eggs, while 17 others had from 2 to 19 each with a total of 153.

Five "luteal" ewes (3 days after beginning of estrus) treated with follicle-stimulating extracts had 57 corpora lutea but only 25 eggs; none of the eggs were fertilized.

Nine anestrous ewes treated with follicle-stimulating extracts had 84 corpora lutea and 25 unfertilized eggs. Four other anestrous ewes treated either with pregnant mare serum or a combination of pregnant mare serum and unfractionated pituitary extract had 8 corpora lutea and 8 eggs. Only one of these eggs was fertilized.

Within the follicular ewes there were significant differences in the ability of different "batches" of follicle-stimulating extract to produce potentially fertile eggs. Likewise, there were significant differences between ewes that were treated alike to produce potentially fertile eggs. These differences are unexplained.

The proportions of corpora lutea represented by recovered eggs were lower in the luteal and anestrous animals than in the follicular animals. It is suggested that this indicates a greater tendency toward entrapment of the ova in the first two groups of ewes.

Footnotes

1 Paper from the Department of Genetics No. 318. This work was supported in part by a grant from the Wisconsin Alumni Research Foundation. Further acknowledgment is due to personnel provided by the National Youth Administration.






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