HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Dailey, R. A. Articles by Casida, L. E. Search for Related Content PubMed PubMed Citation Articles by Dailey, R. A. Articles by Casida, L. E.

Effect of Unilateral Ovariectomy in the Yorkshire and Poland China Prepuberal Gilt¹

University of Wisconsin, Madison

Abstract

Unilateral ovariectomy was performed on Poland China and Yorkshire gilts at either 65 or 170 days of age. Treatment at 65 days resulted in increases in ovarian weights and in the incidence of follicles 1 mm. At 170 days treatment resulted in an increase in the ovarian weight, number of follicles 3 to 4 mm. and 5 to 6 mm. in diameter, the diameter of the largest follicle, the follicular fluid weight, and a decrease in the anterior pituitary gland weight.

The Yorkshire gilts at 72 days of age had heavier ovaries and heavier anterior pituitary glands with greater FSH and LH potencies than the Poland China gilts. Yorkshires had heavier ovaries at 177 days of age, more follicular fluid, heavier uteri and heavier anterior pituitary glands than the Poland Chinas; they had, however, fewer follicles 5 to 6 mm. in diameter and smaller diameters of the largest follicle. None of the Poland China gilts showed estrus; two of 14 control and five of 15 treated Yorkshires showed estrus. No corpora lutea were found in either breed.

¹ This work was done under a cooperative agreement between the Research Division of the College of Agricultural and Life Sciences, University of Wisconsin, and the Animal Husbandry Research Division, A.R.S., U.S.D.A., and supported in part by Cooperative U.S.D.A.-C.S.R.S. Grant No. 816-15-20. It was also supported in part by the Ford Foundation, Grant No. 63–505; and by the Program Project in Genetics. Grant No. GM 15422, from the National Institutes of Health. Published with the approval of the Director of the Research Division of the College, Paper No. 1286 from the Laboratory of Genetics and No. 549 from the Department of Meat and Animal Science.