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


     

J. Anim Sci. 1972. 34:626-629.
© 1972 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 Lamond, D. R.
Right arrow Articles by Kennedy, S. W.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Lamond, D. R.
Right arrow Articles by Kennedy, S. W.

Influence of Season and Nutrition on Luteal Plasma Progesterone in Rambouillet Ewes1, 2,

D. R. Lamond3, R. G. Gaddy and S. W. Kennedy

Clemson University,4 Clemson, South Carolina 29631

Abstract

Plasma concentrations of progesterone in the ewe reach a plateau by about the 10th day of the estrous cycle, though there is considerable variation between days and animals (Stabenfeldt, Holt and Ewing, 1969; Thorburn, Bassett and Smith, 1969). Thorburn et al. (1969) observed variation in the luteal phase peak values of progesterone in the same ewes in successive cycles, which they speculated was due to variation in number of CL.

Season and nutrition influence annual reproductive rhythms and also affect the suppressive action of exogenous progesterone on estrus and ovulation (Lamond, 1963, 1964). The purpose of the present study was to relate luteal phase plasma progesterone concentration to number of CL in ewes maintained for an 8-month period on three nutritional regimes.

Animals and Treatments. Grade Rambouillet ewes were obtained rom Southwest Texas in 1969 and were allotted to three treatment groups in March, 1970, at 2 years of age.

Footnotes

1 Published with the approval of the Director of the South Carolina Experiment Station as Technical Contribution No. 948.

2 We are grateful to Dr. D. M. Henricks for advice concerning the CPB assay.

3 Present address: Department of Clinical Sciences, School of Veterinary Medicine, University of California, Davis 95616.

4 Department of Animal Science.






HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 1972 by the American Society of Animal Science.