Journal of Applied Physiology
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

J Appl Physiol 48: 249-255, 1980;
8750-7587/80 $5.00
This Article
Right arrow Full Text (PDF)
Right arrow Submit a response
Right arrow Alert me when this article is cited
Right arrow Alert me when eLetters are posted
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
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
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by El-Nouty, F. D.
Right arrow Articles by Johnson, H. D.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by El-Nouty, F. D.
Right arrow Articles by Johnson, H. D.

Journal of Applied Physiology, Vol 48, Issue 2 249-255, Copyright © 1980 by American Physiological Society

ARTICLES

Aldosterone and ADH response to heat and dehydration in cattle

F. D. El-Nouty, I. M. Elbanna, T. P. Davis and H. D. Johnson

The effect of heat (35 degrees C) and dehydration under heat (30 h) on plasma levels of antidiuretic hormone (ADH) and aldosterone was studied on four nonpregnant dry Holstein cows. Heat exposure caused a rapid significant rise in plasma ADH without significant changes in hematocrit (Hct), small but significant increase in urine output and a significant reduction in total plasma protein. Dehydration under heat caused a sharp increase in ADH levels associated with a significant decrease in urine output and a significant increase in plasma protein, blood Hct, and serum osmolality. A significant reduction in plasma aldosterone level was observed after 24 h of heat exposure. This was associated with a slight rise in urinary sodium excretion and a significant reduction in serum sodium. Both serum and urinary potassium concentrations were significantly lower under heat. Dehydration resulted in a slow rise in aldosterone but did not reach thermoneutral level. This is probably due to the inhibitory effect of higher serum sodium observed during dehydration on plasma aldosterone secretion. The rise in ADH and decrease in aldosterone during heat exposure may explain why cattle are one of the few species that do not concentrate urine during heat exposure.


This article has been cited by other articles:


Home page
 J ANIM SCIHome page
A. J. Parker, G. P. Dobson, and L. A. Fitzpatrick
Physiological and metabolic effects of prophylactic treatment with the osmolytes glycerol and betaine on Bos indicus steers during long duration transportation
J Anim Sci, November 1, 2007; 85(11): 2916 - 2923.
[Abstract] [Full Text] [PDF]

Home page
 J ANIM SCIHome page
D. T. Beatty, A. Barnes, E. Taylor, D. Pethick, M. McCarthy, and S. K. Maloney
Physiological responses of Bos taurus and Bos indicus cattle to prolonged, continuous heat and humidity
J Anim Sci, April 1, 2006; 84(4): 972 - 985.
[Abstract] [Full Text] [PDF]

Home page
 J ANIM SCIHome page
A. J. Parker, G. P. Hamlin, C. J. Coleman, and L. A. Fitzpatrick
Excess cortisol interferes with a principal mechanism of resistance to dehydration in Bos indicus steers
J Anim Sci, April 1, 2004; 82(4): 1037 - 1045.
[Abstract] [Full Text] [PDF]

Home page
 J ANIM SCIHome page
A. J. Parker, G. P. Hamlin, C. J. Coleman, and L. A. Fitzpatrick
Dehydration in stressed ruminants may be the result of acortisol-induced diuresis
J Anim Sci, February 1, 2003; 81(2): 512 - 519.
[Abstract] [Full Text] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Visit Other APS Journals Online