J. Anim Sci.
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

J. Anim Sci. 1971. 32:1202-1205.
© 1971 American Society of Animal Science
This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Dufour, J.
Right arrow Articles by Casida, L. E.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Dufour, J.
Right arrow Articles by Casida, L. E.

Response of Ovaries to Removal of Corpora Lutea in Sheep1

J. Dufour2, O. J. Ginther and L. E. Casida

University of Wisconsin, Madison 53705

Abstract

Corpora lutea were removed on days 4, 8 or 12 of the estrous cycle in sheep. Ewes were killed on day 8 after the first post-treatment estrus or on the 10th day after surgery if estrus did not occur. Following removal of 2 CL the follicular fluid weight was greater (P<.01) than for removal of 1 CL. The most marked difference in weight of luteal fluid (fluid enclosed within a luteal structure) between removal of 2 CL and removal of 1 CL was in the day 8 group (avg of day 4 plus day 12 groups vs. day 8, interaction, P<.005). Mean weight of luteal tissue per ewe was also greater (P<.05) in the day 8 group than for the mean of day 4 plus day 12 groups. The number of cysts formed was greater (P<.05) following removal on day 8, particularly when 2 CL were removed, as compared to the mean following removal of 1 or 2 CL on day 4 and day 12. However, removal of 2 CL on day 8 decreased (P<.05) the number of normal appearing CL at autopsy.

Intravenous injection 24 hr. following CL removal at day 8 of a pituitary gonadotropin preparation containing both FSH and LH increased (P<.05) the number of luteinized cysts found at autopsy over CL removal alone.

Footnotes

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, A.R.S., U.S.D.A. It was supported in Dart 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. 1438 from the Laboratory of Genetics and No. 680 from the Department of Veterinary Science. Part of this work was presented at the annual meeting of the American Society of Animal Science, Lafayette. Indiana 1969.

2 Under an education leave from the Canadian Government, Department of Agriculture, Research Branch of Lennoxville, Quebec.






HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 1971 by the American Society of Animal Science.