The effect of Brahman genes on body temperature plasticity of heifers on pasture under heat stress
Abstract Bos taurus indicus cattle have the superior ability for the regulation of body temperature during heat stress due to a number of physiological and cellular level adaptive traits. The objectives of this study were to quantify the change in body temperature in heifers with various proportions...
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creator | Mateescu, Raluca G Sarlo-Davila, Kaitlyn M Dikmen, Serdal Rodriguez, Eduardo Oltenacu, Pascal A |
description | Abstract
Bos taurus indicus cattle have the superior ability for the regulation of body temperature during heat stress due to a number of physiological and cellular level adaptive traits. The objectives of this study were to quantify the change in body temperature in heifers with various proportions of Brahman genes per unit increase in heat stress as measured by temperature–humidity index (THI) and to assess how different breed groups responded to varying intensity and duration of heat stress. A total of 299 two-yr-old heifers from six breed groups ranging from 100% Angus to 100% Brahman were evaluated under hot and humid conditions during 2017 and 2018 summer days. Two strategies were used to estimate the plasticity in body temperature of breed groups in response to environmental challenges: 1) a random regression mixed model was used to estimate reaction norm parameters for each breed group in response to a specified environmental heat stress and 2) a repeated measures mixed model was used to evaluate the response to different environmental heat loads. The reaction norm model estimated an intercept and slope measuring the change in body temperature per unit increase in THI environmental heat stress for different breed groups of animals and allowed the identification of genotypes which are robust, with low slope values indicative of animals that are able to maintain normal body temperature across a range of environments. The repeated measures mixed model showed that Brahman cattle have an advantage under moderate or high heat stress conditions but both Angus and Brahman breed groups are greatly affected when heat stress is severe. A critical factor appears to be the opportunity to cool down during the night hours more than the number of hours with extreme THI. With heat stress conditions predicted to intensify and expand into currently temperate zones, developing effective strategies to ensure sustainable beef production systems are imperative. Effective strategies will require the identification of the genes conferring the superior thermotolerance in Brahman cattle. |
doi_str_mv | 10.1093/jas/skaa126 |
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Bos taurus indicus cattle have the superior ability for the regulation of body temperature during heat stress due to a number of physiological and cellular level adaptive traits. The objectives of this study were to quantify the change in body temperature in heifers with various proportions of Brahman genes per unit increase in heat stress as measured by temperature–humidity index (THI) and to assess how different breed groups responded to varying intensity and duration of heat stress. A total of 299 two-yr-old heifers from six breed groups ranging from 100% Angus to 100% Brahman were evaluated under hot and humid conditions during 2017 and 2018 summer days. Two strategies were used to estimate the plasticity in body temperature of breed groups in response to environmental challenges: 1) a random regression mixed model was used to estimate reaction norm parameters for each breed group in response to a specified environmental heat stress and 2) a repeated measures mixed model was used to evaluate the response to different environmental heat loads. The reaction norm model estimated an intercept and slope measuring the change in body temperature per unit increase in THI environmental heat stress for different breed groups of animals and allowed the identification of genotypes which are robust, with low slope values indicative of animals that are able to maintain normal body temperature across a range of environments. The repeated measures mixed model showed that Brahman cattle have an advantage under moderate or high heat stress conditions but both Angus and Brahman breed groups are greatly affected when heat stress is severe. A critical factor appears to be the opportunity to cool down during the night hours more than the number of hours with extreme THI. With heat stress conditions predicted to intensify and expand into currently temperate zones, developing effective strategies to ensure sustainable beef production systems are imperative. Effective strategies will require the identification of the genes conferring the superior thermotolerance in Brahman cattle.</description><identifier>ISSN: 0021-8812</identifier><identifier>EISSN: 1525-3163</identifier><identifier>DOI: 10.1093/jas/skaa126</identifier><identifier>PMID: 32315036</identifier><language>eng</language><publisher>US: Oxford University Press</publisher><subject>Animals ; Body Temperature - genetics ; Cattle - genetics ; Environmental Animal Science ; Female ; Genetic Predisposition to Disease ; Heat Stress Disorders - genetics ; Heat Stress Disorders - veterinary ; Heat-Shock Response ; Hot Temperature ; Humidity ; Seasons ; Temperature ; Thermotolerance - genetics</subject><ispartof>Journal of animal science, 2020-05, Vol.98 (5)</ispartof><rights>The Author(s) 2020. Published by Oxford University Press on behalf of the American Society of Animal Science. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com. 2020</rights><rights>The Author(s) 2020. Published by Oxford University Press on behalf of the American Society of Animal Science. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c412t-cadbf09539dbf16c3ea4d6466d38061d2524d331c00d3a29d9ba213f7da34973</citedby><cites>FETCH-LOGICAL-c412t-cadbf09539dbf16c3ea4d6466d38061d2524d331c00d3a29d9ba213f7da34973</cites><orcidid>0000-0002-2661-1198</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC7236563/pdf/$$EPDF$$P50$$Gpubmedcentral$$H</linktopdf><linktohtml>$$Uhttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC7236563/$$EHTML$$P50$$Gpubmedcentral$$H</linktohtml><link.rule.ids>230,314,723,776,780,881,1578,27901,27902,53766,53768</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/32315036$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Mateescu, Raluca G</creatorcontrib><creatorcontrib>Sarlo-Davila, Kaitlyn M</creatorcontrib><creatorcontrib>Dikmen, Serdal</creatorcontrib><creatorcontrib>Rodriguez, Eduardo</creatorcontrib><creatorcontrib>Oltenacu, Pascal A</creatorcontrib><title>The effect of Brahman genes on body temperature plasticity of heifers on pasture under heat stress</title><title>Journal of animal science</title><addtitle>J Anim Sci</addtitle><description>Abstract
Bos taurus indicus cattle have the superior ability for the regulation of body temperature during heat stress due to a number of physiological and cellular level adaptive traits. The objectives of this study were to quantify the change in body temperature in heifers with various proportions of Brahman genes per unit increase in heat stress as measured by temperature–humidity index (THI) and to assess how different breed groups responded to varying intensity and duration of heat stress. A total of 299 two-yr-old heifers from six breed groups ranging from 100% Angus to 100% Brahman were evaluated under hot and humid conditions during 2017 and 2018 summer days. Two strategies were used to estimate the plasticity in body temperature of breed groups in response to environmental challenges: 1) a random regression mixed model was used to estimate reaction norm parameters for each breed group in response to a specified environmental heat stress and 2) a repeated measures mixed model was used to evaluate the response to different environmental heat loads. The reaction norm model estimated an intercept and slope measuring the change in body temperature per unit increase in THI environmental heat stress for different breed groups of animals and allowed the identification of genotypes which are robust, with low slope values indicative of animals that are able to maintain normal body temperature across a range of environments. The repeated measures mixed model showed that Brahman cattle have an advantage under moderate or high heat stress conditions but both Angus and Brahman breed groups are greatly affected when heat stress is severe. A critical factor appears to be the opportunity to cool down during the night hours more than the number of hours with extreme THI. With heat stress conditions predicted to intensify and expand into currently temperate zones, developing effective strategies to ensure sustainable beef production systems are imperative. Effective strategies will require the identification of the genes conferring the superior thermotolerance in Brahman cattle.</description><subject>Animals</subject><subject>Body Temperature - genetics</subject><subject>Cattle - genetics</subject><subject>Environmental Animal Science</subject><subject>Female</subject><subject>Genetic Predisposition to Disease</subject><subject>Heat Stress Disorders - genetics</subject><subject>Heat Stress Disorders - veterinary</subject><subject>Heat-Shock Response</subject><subject>Hot Temperature</subject><subject>Humidity</subject><subject>Seasons</subject><subject>Temperature</subject><subject>Thermotolerance - genetics</subject><issn>0021-8812</issn><issn>1525-3163</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNp9kE1Lw0AQhhdRbK2evMuevEjs7k5221wELX5BwUvvYZKdNKltEnY3Qv-9qa2iF08vzDzzDjyMXUpxK0UC4xX6sX9HlMocsaHUSkcgDRyzoRBKRtOpVAN25v1KCKl0ok_ZABRILcAMWbYoiVNRUB54U_AHh-UGa76kmjxvap41dssDbVpyGDpHvF2jD1Vehe2OL6kqyH2RbT_fAV1tyfULDNwHR96fs5MC154uDjlii6fHxewlmr89v87u51EeSxWiHG1WiERD0qc0ORDG1sTGWJgKI63SKrYAMhfCAqrEJhkqCcXEIsTJBEbsbl_bdtmGbE51cLhOW1dt0G3TBqv076auynTZfKQTBUYb6Atu9gW5a7x3VPzcSpHuTKe96fRguqevfr_7Yb_V9sD1Hmi69t-mT_69iog</recordid><startdate>20200501</startdate><enddate>20200501</enddate><creator>Mateescu, Raluca G</creator><creator>Sarlo-Davila, Kaitlyn M</creator><creator>Dikmen, Serdal</creator><creator>Rodriguez, Eduardo</creator><creator>Oltenacu, Pascal A</creator><general>Oxford University Press</general><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>5PM</scope><orcidid>https://orcid.org/0000-0002-2661-1198</orcidid></search><sort><creationdate>20200501</creationdate><title>The effect of Brahman genes on body temperature plasticity of heifers on pasture under heat stress</title><author>Mateescu, Raluca G ; Sarlo-Davila, Kaitlyn M ; Dikmen, Serdal ; Rodriguez, Eduardo ; Oltenacu, Pascal A</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c412t-cadbf09539dbf16c3ea4d6466d38061d2524d331c00d3a29d9ba213f7da34973</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2020</creationdate><topic>Animals</topic><topic>Body Temperature - genetics</topic><topic>Cattle - genetics</topic><topic>Environmental Animal Science</topic><topic>Female</topic><topic>Genetic Predisposition to Disease</topic><topic>Heat Stress Disorders - genetics</topic><topic>Heat Stress Disorders - veterinary</topic><topic>Heat-Shock Response</topic><topic>Hot Temperature</topic><topic>Humidity</topic><topic>Seasons</topic><topic>Temperature</topic><topic>Thermotolerance - genetics</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Mateescu, Raluca G</creatorcontrib><creatorcontrib>Sarlo-Davila, Kaitlyn M</creatorcontrib><creatorcontrib>Dikmen, Serdal</creatorcontrib><creatorcontrib>Rodriguez, Eduardo</creatorcontrib><creatorcontrib>Oltenacu, Pascal A</creatorcontrib><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>PubMed Central (Full Participant titles)</collection><jtitle>Journal of animal science</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Mateescu, Raluca G</au><au>Sarlo-Davila, Kaitlyn M</au><au>Dikmen, Serdal</au><au>Rodriguez, Eduardo</au><au>Oltenacu, Pascal A</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>The effect of Brahman genes on body temperature plasticity of heifers on pasture under heat stress</atitle><jtitle>Journal of animal science</jtitle><addtitle>J Anim Sci</addtitle><date>2020-05-01</date><risdate>2020</risdate><volume>98</volume><issue>5</issue><issn>0021-8812</issn><eissn>1525-3163</eissn><abstract>Abstract
Bos taurus indicus cattle have the superior ability for the regulation of body temperature during heat stress due to a number of physiological and cellular level adaptive traits. The objectives of this study were to quantify the change in body temperature in heifers with various proportions of Brahman genes per unit increase in heat stress as measured by temperature–humidity index (THI) and to assess how different breed groups responded to varying intensity and duration of heat stress. A total of 299 two-yr-old heifers from six breed groups ranging from 100% Angus to 100% Brahman were evaluated under hot and humid conditions during 2017 and 2018 summer days. Two strategies were used to estimate the plasticity in body temperature of breed groups in response to environmental challenges: 1) a random regression mixed model was used to estimate reaction norm parameters for each breed group in response to a specified environmental heat stress and 2) a repeated measures mixed model was used to evaluate the response to different environmental heat loads. The reaction norm model estimated an intercept and slope measuring the change in body temperature per unit increase in THI environmental heat stress for different breed groups of animals and allowed the identification of genotypes which are robust, with low slope values indicative of animals that are able to maintain normal body temperature across a range of environments. The repeated measures mixed model showed that Brahman cattle have an advantage under moderate or high heat stress conditions but both Angus and Brahman breed groups are greatly affected when heat stress is severe. A critical factor appears to be the opportunity to cool down during the night hours more than the number of hours with extreme THI. With heat stress conditions predicted to intensify and expand into currently temperate zones, developing effective strategies to ensure sustainable beef production systems are imperative. Effective strategies will require the identification of the genes conferring the superior thermotolerance in Brahman cattle.</abstract><cop>US</cop><pub>Oxford University Press</pub><pmid>32315036</pmid><doi>10.1093/jas/skaa126</doi><orcidid>https://orcid.org/0000-0002-2661-1198</orcidid><oa>free_for_read</oa></addata></record> |
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subjects | Animals Body Temperature - genetics Cattle - genetics Environmental Animal Science Female Genetic Predisposition to Disease Heat Stress Disorders - genetics Heat Stress Disorders - veterinary Heat-Shock Response Hot Temperature Humidity Seasons Temperature Thermotolerance - genetics |
title | The effect of Brahman genes on body temperature plasticity of heifers on pasture under heat stress |
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