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


     

J. Anim Sci. 1974. 38:437-441.
© 1974 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 Fox, D. G.
Right arrow Articles by Johnson, R. R.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Fox, D. G.
Right arrow Articles by Johnson, R. R.

Plasma Growth Hormone Levels and Thyroid Secretion Rates during Compensatory Growth in Beef Cattle1

D. G. Fox2, R. L. Preston, B. Senft3 and R. R. Johnson4

Ohio Agricultural Research and Development Center, Wooster 44691

Abstract

Plasma growth hormone levels and thyroid secretion rates were measured at different live weights in uncatheterized and catheterized steers fed two different energy levels continuously (controls) or following a period of restriction (compensatory). Growth hormone levels varied between the control and compensatory steers and with energy level in the ration. In all but two treatment groups in both uncatheterized and catheterized steers, the compensatory steers had lower plasma growth hormone levels than controls. Thus, there was a negative relationship between rate of protein deposition and plasma growth hormone level. Compensatory steers had lower thyroid secretion rates during the period of restriction and during the first part of the full feeding period in most treatment groups. Thyroid secretion rates increased to or above the level of controls as the full feeding period progressed. These changes in thyroid secretion rates suggest that there was a lower energy requirement for maintenance during the period of energy restriction and the first part of the full feeding period, thus contributing to the ability of the cattle to utilize energy and protein more efficiently when placed on full feed.

Footnotes

1 Approved as Journal Article No. 42-73 by the Associate Director for the Ohio Agricultural Research and Development Center, Wooster.

2 Present Address: Animal Science Department, Cornell University, Ithaca, N.Y.

3 Present Address: Institut für Tierzucht and Haustiergenetik, University of Giessen, West Germany.

4 Present Address: Animal Science Department, Oklahoma State University, Stillwater.






HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 1974 by the American Society of Animal Science.