JDS
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

Journal of Dairy Science Vol. 73 No. 11 3258-3265
© 1990 by American Dairy Science Association ®
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 Burton, J. L.
Right arrow Articles by Eggert, R. G.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Burton, J. L.
Right arrow Articles by Eggert, R. G.

Health and Reproductive Performance of Dairy Cows Treated for up to Two Consecutive Lactations with Bovine Somatotropin

J. L. Burton 1, B. W. McBride 1, J. H. Burton 1, and R. G. Eggert 1

1 Department of Animal and Poultry Science, University of Guelph, Guelph, Ontario, Canada N1G 2W1

Forty-three purebred Holstein cows were put on an rbST milk production trial. There were 15 control cows (saline-injected), 15 cows injected with 10.3 mg rbST/d and 13 cows injected with 20.6 mg rbST/d. Injections were initiated between wk 4 and 5 of lactation and continued for 266 consecutive days. Fourteen of the rbST-treated cows were treated with one of three dosages of rbST in the previous lactation (10.3, 20.6, or 41.2 rbST/d). The objective of this study was to determine the health and reproductive efficiency of cows treated with rbST for up to two consecutive lactations relative to control cows. The incidence of 11 health-related variables before, during, and after the 38-wk injection period were not different among treatment groups. Previous treatment with rbST had no effect on reproductive variables; however, there was evidence that injections with the highest dosage of rbST in the current lactation resulted in lowered reproductive efficiency. It is possible that the effects of rbST on early lactation energy and nitrogen balance have confounding effects on the estrous cycle.

Key Words: somatotropin • health • reproduction

Submitted on February 19, 1990
Accepted on June 11, 1990




This article has been cited by other articles:


Home page
 J DAIRY SCIHome page
A. Al-Seaf, J. F. Keown, and L. D. Van Vleck
Genetic Parameters for Yield Traits of Cows Treated or Not Treated with Bovine Somatotropin
J Dairy Sci, January 1, 2007; 90(1): 501 - 506.
[Abstract] [Full Text] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 1990 by the American Dairy Science Association ®.