Tympanic temperature in confined beef cattle exposed to excessive heat load

Mader, T. L., Gaughan, J. B., Johnson, L. J. and Hahn, G. L. (2010) Tympanic temperature in confined beef cattle exposed to excessive heat load. International Journal of Biometeorology, 54 6: 629-635. doi:10.1007/s00484-009-0229-0


Author Mader, T. L.
Gaughan, J. B.
Johnson, L. J.
Hahn, G. L.
Title Tympanic temperature in confined beef cattle exposed to excessive heat load
Journal name International Journal of Biometeorology   Check publisher's open access policy
ISSN 0020-7128
Publication date 2010-11
Year available 2009
Sub-type Article (original research)
DOI 10.1007/s00484-009-0229-0
Volume 54
Issue 6
Start page 629
End page 635
Total pages 7
Place of publication Amsterdam, Netherlands
Publisher Springer
Collection year 2011
Language eng
Formatted abstract
Angus crossbred yearling steers (n=168) were used to evaluate effects on performance and tympanic temperature (TT) of feeding additional potassium and sodium to steers exposed to excessive heat load (maximum daily ambient temperature exceeded 32°C for three consecutive days) during seasonal summer conditions. Steers were assigned one of four treatments: (1) control; (2) potassium supplemented (diet containing 2.10% KHCO3); (3) sodium supplemented (diet containing 1.10% NaCl); or (4) potassium and sodium supplemented (diet containing 2.10% KHCO3 and 1.10% NaCl). Overall, additional KHCO3 at the 2% level or NaCl at the 1% level did not improve performance or heat stress tolerance with these diet formulations. However, the addition of KHCO3 did enhance water intake. Independent of treatment effects, TT of cattle displaying high, moderate, or low levels of stress suggest that cattle that do not adequately cool down at night are prone to achieving greater body temperatures during a subsequent hot day. Cattle that are prone to get hot but can cool at night can keep average tympanic temperatures at or near those of cattle that tend to consistently maintain lower peak and mean body temperatures. In addition, during cooler and moderately hot periods, cattle change TT in a stair-step or incremental pattern, while under hot conditions, average TT of group-fed cattle moves in conjunction with ambient conditions, indicating that thermoregulatory mechanisms are at or near maximum physiological capacity. © 2009 ISB.
Keyword Beef cattle
Body temperature
Diets
Environment
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Available online 30 April 2009

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2010 Higher Education Research Data Collection
School of Agriculture and Food Sciences
 
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Created: Sun, 12 Dec 2010, 00:06:39 EST