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 Foote, W. C. Search for Related Content PubMed PubMed Citation Articles by Foote, W. C.

Some Influences of Lactation and Hormone Treatment on Uterine Changes in Postpartum Sheep¹

Utah State University, Logan 84321

Abstract

UTERINE changes in the ewe during the early postpartum period have received very little attention compared to studies on other aspects of anestrus. The increasing emphasis on improving reproductive efficiency has help focus attention on the role of the uterus.

W. C. Foote and M. A. Madsen (unpublished data) studied estrus, ovulation and conception in early postpartum spring lambing ewes following treatment with different sequences of estradiol-17ß, progesterone and PMS. Some results are shown in table 1. Seventy-five percent of the ewes in group 2, which received all three hormones, showed both estrus and ovulation by day 19. Treatment was started on day 3 or 4 after parturition and terminated on day 17 or 18. Only 5% of the ewes in this group lambed, however. In studies that have been conducted at later periods postpartum (50 days or more) the percent ewes becoming pregnant to breeding following hormone treatment is frequently greater than 50%.

¹ IX Biennial Symposium on Animal Reproduction. Published with the approval of the Utah Agricultural Experiment Station as Paper No. 948. Partial financial support provided by G. D. Searle and Co. Hormones provided by Eli Lilly Co. and G. D. Searle and Co.