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


     

J. Anim Sci. 1983. 57:338-342.
© 1983 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 HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Dodson, M. V.
Right arrow Articles by Ercanbrack, S. K.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Dodson, M. V.
Right arrow Articles by Ercanbrack, S. K.

Temporal Patterns of Growth Hormone, Prolacting and Thyrotropin Secretion in Targhee Rams Selected for Rate and Efficiency of Gain1

M. V. Dodson2, S. L. Davis, D. L. Ohlson3 and S. K. Ercanbrack4,5,

University of Idaho, Moscow 83843 and and US Department of Agriculture6, Dubois, ID 83423

Abstract

Thirteen Targhee rams selected for rate and efficiency of gain for 4 yr (1.5 generations) were compared with 10 rams from a Targhee line with no selection for over 20 yr to determine if selection for these traits would be associated with changes in the secretion of growth hormone (GH), thyrotropin (TSH) and(or) prolactin (PRL). Selected rams exhibited greater birth weight, average daily gain (ADG) and feed consumed/day during a 6-wk individual feeding regimen, and exhibited greater overall ADG during a 16-wk feeding trial as compared with the unselected rams. Temporal blood plasma samples were collected at 15-min intervals for 8 h from each of the 23 rams for hormone analysis. Selected rams exhibited greater overall mean GH (6.1 ± .4 vs 4.6 ± .5 ng/ml), overall mean TSH (8.6 ± 1.2 vs 6.2 ± .7 ng/ml) and baseline mean TSH (8.0 ± 1.1 vs 5.6 ± .5 ng/ml) than the unselected rams. Although the adjusted GH spike amplitude value was higher in the selected line (12.1 ± 3.0 vs 7.4 ± .8 ng/ml), this difference was not significant. No differences were observed with any of the variables of PRL secretion. In addition, there were no significant correlations between any of the hormone variables and any of the feed or gain data. These data support the hypothesis that Targhee rams selected for rate and efficiency of gain exhibit higher plasma levels of GH and TSH than unselected rams of the same breed.

Footnotes

1 Idaho Agr. Exp. Sta. Pub. No. 8243.

2 Current address: Univ. of Arizona, Tucson 85721.

3 Dept. Anim. Sci.

4 These studies were supported in part by the USDA and the Idaho Agr. Exp. Sta.

5 The authors express their gratitude to Ms. Debbi Blann for her excellent technical assistance; Dr. A. E. Wilhelmi for supplying purified GH for radioiodination and reference standard; Dr. J. G. Pierce for supplying purified TSH; Dr. L. E. Reichert for supplying purified PRL, and NIH, National Pituitary Agency, for supplying ovine PRL and TSH used for reference standards.

6 US Sheep Exp. Sta.




This article has been cited by other articles:


Home page
 J ANIM SCIHome page
G. D. Snowder and L. D. Van Vleck
Effect of duration of performance test on variance component estimates for lamb growth rate
J Anim Sci, August 1, 2002; 80(8): 2078 - 2084.
[Abstract] [Full Text] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 1983 by the American Society of Animal Science.