Assessing the heat tolerance of 17 beef cattle genotypes

Gaughan, J. B., Mader, T. L., Holt, S. M., Sullivan, M. L. and Hahn G. L. (2010) Assessing the heat tolerance of 17 beef cattle genotypes. International Journal of Biometeorology, 54 6: 617-627. doi:10.1007/s00484-009-0233-4

Author Gaughan, J. B.
Mader, T. L.
Holt, S. M.
Sullivan, M. L.
Hahn G. L.
Title Assessing the heat tolerance of 17 beef cattle genotypes
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/s00484-009-0233-4
Volume 54
Issue 6
Start page 617
End page 627
Total pages 11
Editor Scott C. Sheridan
Place of publication Heidelberg, Germany
Publisher Springer
Collection year 2011
Language eng
Subject C1
830301 Beef Cattle
070203 Animal Management
Formatted abstract
Cattle production plays a significant role in terms of world food production. Nearly 82% of the world’s 1.2 billion cattle can be found in developing countries. An increasing demand for meat in developing countries has seen an increase in intensification of animal industries, and a move to cross-bred animals. Heat tolerance is considered to be one of the most important adaptive aspects for cattle, and the lack of thermally-tolerant breeds is a major constraint on cattle production in many countries. There is a need to not only identify heat tolerant breeds, but also heat tolerant animals within a non-tolerant breed. Identification of heat tolerant animals is not easy under field conditions. In this study, panting score (0 to 4.5 scale where 0 = no stress and 4.5 = extreme stress) and the heat load index (HLI) [HLIBG<25°C = 10.66 + 0.28 × rh + 1.30 × BG – WS; and, HLI BG> 25°C = 8.62 + 0.38 × rh + 1.55 × BG – 0.5 × WS + e(2.4 – WS), where BG = black globe temperature (oC), rh = relative humidity (decimal form), WS = wind speed (m/s) and e is the base of the natural logarithm] were used to assess the heat tolerance of 17 genotypes (12,757 steers) within 13 Australian feedlots over three summers. The cattle were assessed under natural climatic conditions in which HLI ranged from thermonuetral (HLI < 70) to extreme (HLI > 96; black globe temperature = 40.2°C, relative humidity = 64%, wind speed = 1.58 m/s). When HLI > 96 a greater number (P < 0.001) of pure bred Bos taurus and crosses of Bos taurus cattle had a panting score ≥ 2 compared to Brahman cattle, and Brahman-cross cattle. The heat tolerance of the assessed breeds was verified using panting scores and the HLI. Heat tolerance of cattle can be assessed under field conditions by using panting score and HLI.
© 2009 ISB.
Keyword Heat tolerance
Panting score
Heat load index
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Published online: 21 May 2009 'IJBM Special Issue - Honoring work of Leroy Hahn'

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Agriculture and Food Sciences
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Citation counts: TR Web of Science Citation Count  Cited 32 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 39 times in Scopus Article | Citations
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Created: Fri, 30 Apr 2010, 09:54:26 EST by Keryn Eaton on behalf of School of Animal Studies