Evaluation of thermal stress indexes for dairy cows in tropical regions

Evaluation of thermal stress indexes for dairy cows in tropical regions

Data from 359 Holstein and 54 Jersey cows (total of 1359 observations) collected in commercial herds in the northeast of Brazil were used to evaluate six environmental stress indexes. The selection criterion was the correlation between the index value with the rectal temperature (RT) and the respiratory rate (RR) of cows. Both Temperature-Humidity Index (THI) and Black Globe-Humidity Index (BGHI) had the lowest correlations with animal RT and RR. The selected indexes were the Equivalent Temperature Index (r = 0.293 and 0.520 with RT and RR, respectively) and the Heat Load Index (0.286 and 0.542, respectively).

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Main Authors: Silva,Roberto Gomes da, Morais,Débora Andréa Evangelista Façanha, Guilhermino,Magda Maria
Format: Digital revista
Language:English
Published: Sociedade Brasileira de Zootecnia 2007
Online Access:http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982007000500028
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spelling oai:scielo:S1516-359820070005000282007-08-20Evaluation of thermal stress indexes for dairy cows in tropical regionsSilva,Roberto Gomes daMorais,Débora Andréa Evangelista FaçanhaGuilhermino,Magda Maria dairy cattle thermal comfort index tropical environment Data from 359 Holstein and 54 Jersey cows (total of 1359 observations) collected in commercial herds in the northeast of Brazil were used to evaluate six environmental stress indexes. The selection criterion was the correlation between the index value with the rectal temperature (RT) and the respiratory rate (RR) of cows. Both Temperature-Humidity Index (THI) and Black Globe-Humidity Index (BGHI) had the lowest correlations with animal RT and RR. The selected indexes were the Equivalent Temperature Index (r = 0.293 and 0.520 with RT and RR, respectively) and the Heat Load Index (0.286 and 0.542, respectively).info:eu-repo/semantics/openAccessSociedade Brasileira de ZootecniaRevista Brasileira de Zootecnia v.36 n.4 suppl.0 20072007-08-01info:eu-repo/semantics/articletext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982007000500028en10.1590/S1516-35982007000500028
institution SCIELO
collection OJS
country Brasil
countrycode BR
component Revista
access En linea
databasecode rev-scielo-br
tag revista
region America del Sur
libraryname SciELO
language English
format Digital
author Silva,Roberto Gomes da
Morais,Débora Andréa Evangelista Façanha
Guilhermino,Magda Maria
spellingShingle Silva,Roberto Gomes da
Morais,Débora Andréa Evangelista Façanha
Guilhermino,Magda Maria
Evaluation of thermal stress indexes for dairy cows in tropical regions
author_facet Silva,Roberto Gomes da
Morais,Débora Andréa Evangelista Façanha
Guilhermino,Magda Maria
author_sort Silva,Roberto Gomes da
title Evaluation of thermal stress indexes for dairy cows in tropical regions
title_short Evaluation of thermal stress indexes for dairy cows in tropical regions
title_full Evaluation of thermal stress indexes for dairy cows in tropical regions
title_fullStr Evaluation of thermal stress indexes for dairy cows in tropical regions
title_full_unstemmed Evaluation of thermal stress indexes for dairy cows in tropical regions
title_sort evaluation of thermal stress indexes for dairy cows in tropical regions
description Data from 359 Holstein and 54 Jersey cows (total of 1359 observations) collected in commercial herds in the northeast of Brazil were used to evaluate six environmental stress indexes. The selection criterion was the correlation between the index value with the rectal temperature (RT) and the respiratory rate (RR) of cows. Both Temperature-Humidity Index (THI) and Black Globe-Humidity Index (BGHI) had the lowest correlations with animal RT and RR. The selected indexes were the Equivalent Temperature Index (r = 0.293 and 0.520 with RT and RR, respectively) and the Heat Load Index (0.286 and 0.542, respectively).
publisher Sociedade Brasileira de Zootecnia
publishDate 2007
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982007000500028
work_keys_str_mv AT silvarobertogomesda evaluationofthermalstressindexesfordairycowsintropicalregions
AT moraisdeboraandreaevangelistafacanha evaluationofthermalstressindexesfordairycowsintropicalregions
AT guilherminomagdamaria evaluationofthermalstressindexesfordairycowsintropicalregions
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