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


     

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 Williams, J. E.
Right arrow Articles by Hannah, S.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Williams, J. E.
Right arrow Articles by Hannah, S.

Journal of Animal Science, Vol 69, Issue 4 1688-1696, Copyright © 1991 by American Society of Animal Science

JOURNAL ARTICLE

Influence of zeranol and breed on growth, composition of gain, and plasma hormone concentrations

J. E. Williams, S. J. Ireland, T. A. Mollett, D. L. Hancock, E. E. Beaver and S. Hannah
University of Missouri, Columbia 65211.

Seven Angus and six Brangus steers averaging 225 and 245 kg, respectively, were assigned randomly to zeranol (36 mg) implant (I) and no implant (NI) treatments. Steers had ad libitum access to a corn silage diet plus .68 kg of a soybean meal-based supplement fed daily. Steers were bled via jugular catheters on d 0, 28, 56, and 84 at 15-min intervals for 4 h before and 4 h after feeding. Concentrations of growth hormone (GH), insulin (INS), triiodothyronine (T3), thyroxine (T4), and glucose were determined. Whole-body protein and fat contents were monitored. A breed x I interaction (for d 56 to 84 and d 0 to 84) was observed for ADG (P less than .05 and P less than .07, respectively), feed conversion (P less than .05 and P less than .07, respectively), and protein deposition (for d 0 to 29 and d 0 to 84; P less than .07 and P less than .05, respectively). These interactions were attributed to a greater response to I by Angus than by Brangus steers. A feeding x period interaction (P less than .10) was observed for mean GH concentration, and INS, T4, and T3 concentrations were higher (P less than .05) during the 4-h postfeeding period than during the 4-h prefeeding period. The implant increased (P less than .08) mean GH concentration but did not alter the frequency, duration, or amplitude of plasma GH peaks. Steers that were implanted had lower (P less than .05) plasma T3. Brangus steers had lower (P less than .05) plasma glucose, T3, and T4 concentrations than Angus steers. Results indicate that growth factors beyond those measured are responsible for the anabolic response to zeranol.


This article has been cited by other articles:


Home page
 J ANIM SCIHome page
S. L. Gruber, J. D. Tatum, T. E. Engle, M. A. Mitchell, S. B. Laudert, A. L. Schroeder, and W. J. Platter
Effects of ractopamine supplementation on growth performance and carcass characteristics of feedlot steers differing in biological type
J Anim Sci, July 1, 2007; 85(7): 1809 - 1815.
[Abstract] [Full Text] [PDF]

Home page
 J DAIRY SCIHome page
W. J. Weber, L. H. Baumgard, G. W. Kazmer, S. A. Zinn, L. B. Hansen, H. Chester-Jones, and B. A. Crooker
Growth Hormone Response to Growth Hormone Releasing Hormone in Calves that Differ in Genetic Merit for Milk Yield
J Dairy Sci, May 1, 2005; 88(5): 1723 - 1731.
[Abstract] [Full Text] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 1991 by the American Society of Animal Science.