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


     

J. Anim Sci. 1971. 32:1206-1211.
© 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 Falkenburg, J. A.
Right arrow Articles by Kaltenbach, C. C.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Falkenburg, J. A.
Right arrow Articles by Kaltenbach, C. C.

Effects of Hormone Combinations on Estrus, Ovulation and Fertility in Ewes1

J. A. Falkenburg2, C. V. Hulet and C. C. Kaltenbach3

University of Wyoming, Laramie 82070 and U. S. Department of Agriculture, Dubois, Idaho 83423

Abstract

INTEREST is increasing in the use of hormones to control or manipulate the estrous cycle and breeding season of sheep. Complete understanding of the role estrogen plays, not only in preparing the uterus for pregnancy but also in the estrous and ovulatory mechanism, may lead to more effective methods for artificially controlling the reproductive cycle.

The purpose of this study was to determine the effect of estradiol-17ß on ovulation rate and fertility when given alone and in combination with PMS in estrous synchronized ewes during the normal breeding season.

Materials and Methods

The experimental study was conducted in three trials. Trial 1 involved 121 mature ewes of mixed ages representing the Columbia, Rambouillet and Targhee breeds. The ewes were randomized within breed and age to 13 treatments (table 1). The effects of treatment on estrus and number of corpora lutea (CL) were studied in the first two trials. In trial 3 fertility and the number of embryos was observed in addition to estrus and number of CL.

Footnotes

1 From U.S. Sheep Experiment Station, Sheep and Fur Animal Research Branch, Animal Husbandry Research Division. A.R.S., Dubois, Idaho in cooperation with the University of Idaho, Moscow and the University of Wyoming. Laramie. Published with approval of the Director. Wyoming Agricultural Experiment Station, as Journal Paper No. 442.

2 Present address: Cooperative Extension Service, University of Nebraska, Lincoln.

3 Animal Science Department, University of Wyoming, Laramie.






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