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


     

Journal of Dairy Science Vol. 74 No. 3 840-851
© 1991 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 West, J. W.
Right arrow Articles by Sandifer, T. G.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by West, J. W.
Right arrow Articles by Sandifer, T. G.

Effects of Bovine Somatotropin on Physiologic Responses of Lactating Holstein and Jersey Cows During Hot, Humid Weather

J. W. West 1, B. G. Mullinix 1, and T. G. Sandifer 1

1 Department of Animal Science, University of Georgia, Coastal Plain Experiment Station, Tifton 31793

Thirty-one lactating Holstein and Jersey cows were used to determine the effects of daily injections of 0 or 20 mg of recombinant bST on physiologic responses during hot, humid weather. Body temperature was determined by measuring milk temperature at each milking. Jugular blood was sampled for serum analysis of selected hormones, blood metabolites, and fatty acids, and arterial blood was sampled for blood pH and blood gas analysis. Milk was characterized for fatty acid composition. Blood pH was unchanged, but partial pressure of blood CO2, blood bicarbonate, base excess, and total CO2 declined with administration of bST. Serum triglycerides increased 89% in cows receiving bST. Blood urea nitrogen tended to decline in cows receiving bST. Serum cortisol, triiodothyronine, and thyroxine did not change, but insulin-like growth factor-1 increased 128% with bST use. Reduced milk short-chain fatty acids, increased milk long-chain fatty acids, and increased blood serum C18:1 fatty acid content occurred in cows administered bST and probably reflected tissue mobilization. Cows administered bST in hot weather had higher milk temperatures. Alterations in physiologic and metabolic measures in association with higher milk temperature suggest an interaction of bST use with hot, humid weather and reflect the need to minimize the effects of heat stress.

Key Words: bovine somatotropin • heat • stress • acid-base balance

Submitted on May 9, 1990
Accepted on October 1, 1990




This article has been cited by other articles:


Home page
 J DAIRY SCIHome page
R. S. Settivari, J. N. Spain, M. R. Ellersieck, J. C. Byatt, R. J. Collier, and D. E. Spiers
Relationship of Thermal Status to Productivity in Heat-Stressed Dairy Cows Given Recombinant Bovine Somatotropin
J Dairy Sci, March 1, 2007; 90(3): 1265 - 1280.
[Abstract] [Full Text] [PDF]

Home page
 J DAIRY SCIHome page
J. W. West
Effects of Heat-Stress on Production in Dairy Cattle
J Dairy Sci, June 1, 2003; 86(6): 2131 - 2144.
[Abstract] [Full Text] [PDF]

Home page
 J DAIRY SCIHome page
Z. O. Keister, K. D. Moss, H. M. Zhang, T. Teegerstrom, R. A. Edling, R. J. Collier, and R. L. Ax
Physiological Responses in Thermal Stressed Jersey Cows Subjected to Different Management Strategies
J Dairy Sci, December 1, 2002; 85(12): 3217 - 3224.
[Abstract] [Full Text] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 1991 by the American Dairy Science Association ®.