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


     

J. Anim Sci. 1949. 8:550-557.
© 1949 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 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 Tanabe, T. Y.
Right arrow Articles by Grummer, R. H.
Right arrow Search for Related Content
PubMed
Right arrow Articles by Tanabe, T. Y.
Right arrow Articles by Grummer, R. H.

The Effects of Gonadotrophins Administered to Sows and Gilts during Different Stages of the Estrual Cycle1

T. Y. Tanabe, A. C. Warnick, L. E. Casida and R. H. Grummer

University of Wisconsin

Abstract

The effects of gonadotrophins administered during different stages of the estrual cycle were studied in 22 sows and 45 gilts. Both purebred and grade Poland Chinas and Chester Whites were used.

Both artificial insemination and natural mating resulted in semen being deposited directly into the uterus of the sow in the luteal phase of the estrual cycle.

Seminal residues persisted for a longer time in the uterus of the luteal phase sow than in that of the follicular one.

Ovulation occurred 36–48 hours after an intravenous injection of sheep pituitary extract whether administered on the 6th, 17th, or 20th day of the estrual cycle.

The intravenous injection when given alone resulted in a larger number of ovulations when administered to gilts in the follicular phase than to those in the luteal phase. When this injection followed treatment with PMS there was a similar difference between the phases in the sows but not in the gilts. This apparent age difference is not explained.

A marked difference in the incidence of fertilized eggs occurred between animals treated in the two phases: Avg. 5.3 in the follicular as contrasted to 0.0 in the luteal in one trial and 8.3 and 6.5 as contrasted to 0.0 and 0.5 in another.

Footnotes

1 Paper No. 398 from the Department of Genetics. Published with the approval of the Director of the Agricultural Experiment Station.






HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 1949 by the American Society of Animal Science.