Influence of season and external morphology on thermal comfort and physiological responses in bulls from two breeds adapted to a subtropical climate

Detalhes bibliográficos
Autor(a) principal: SOUTO,Paula Lorena Grangeira
Data de Publicação: 2021
Outros Autores: BARBOSA,Eleonara Araújo, MARTINS,Edison, MARTINS,Vera Maria Villamil, HATAMOTO-ZERVOUDAKIS,Luciana Keiko, PIMENTEL,Concepta Margaret Mcmanus, RAMOS,Alexandre Floriani
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Revista Brasileira de Saúde e Produção Animal
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1519-99402021000100501
Resumo: ABSTRACT Animals in subtropical regions can be exposed to periods of thermal stress. Locally adapted breeds are especially important in this context, but these have little information available in their natural environments. The aim of this study was to assess whether season affects thermal comfort and physiological responses to increased temperatures of two breeds of bulls in a subtropical climate. Four Angus and four Crioulo Lageano bulls were used in this study. Body and testicles measurements, skin pigmentation and thickness, hair number, length and pigmentation, respiratory rate, panting score, rectal temperature and haematological profile were recorded on three occasions in summer and winter, morning and afternoon. The surface temperature of the flank, eye and scrotum were obtained by infrared thermography. Hair coat colour was determined by CIELAB method. Thermal comfort indexes were calculated from meteorological data. Statistical analysis included analyses of variance, correlations and a partial least squares regression in determining which traits were the most important in thermal adaptability. External morphology of the bulls was important for explaining physiological changes in both seasons, but their contribution was greater in summer. Bulls experienced moderate heat stress in summer, which led to significant physiological responses, which were more pronounced in Angus bulls. The main differences in thermal adaptation found between breeds were the hair coat characteristics and respiratory rate. Despite using different mechanisms to cope with environmental challenges, all bulls were able to maintain optimal testicular thermoregulation as well as systemic normothermia throughout the seasons, showing good adaptation to the climate conditions.
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spelling Influence of season and external morphology on thermal comfort and physiological responses in bulls from two breeds adapted to a subtropical climateconservationreproductionstressthermographythermoregulationABSTRACT Animals in subtropical regions can be exposed to periods of thermal stress. Locally adapted breeds are especially important in this context, but these have little information available in their natural environments. The aim of this study was to assess whether season affects thermal comfort and physiological responses to increased temperatures of two breeds of bulls in a subtropical climate. Four Angus and four Crioulo Lageano bulls were used in this study. Body and testicles measurements, skin pigmentation and thickness, hair number, length and pigmentation, respiratory rate, panting score, rectal temperature and haematological profile were recorded on three occasions in summer and winter, morning and afternoon. The surface temperature of the flank, eye and scrotum were obtained by infrared thermography. Hair coat colour was determined by CIELAB method. Thermal comfort indexes were calculated from meteorological data. Statistical analysis included analyses of variance, correlations and a partial least squares regression in determining which traits were the most important in thermal adaptability. External morphology of the bulls was important for explaining physiological changes in both seasons, but their contribution was greater in summer. Bulls experienced moderate heat stress in summer, which led to significant physiological responses, which were more pronounced in Angus bulls. The main differences in thermal adaptation found between breeds were the hair coat characteristics and respiratory rate. Despite using different mechanisms to cope with environmental challenges, all bulls were able to maintain optimal testicular thermoregulation as well as systemic normothermia throughout the seasons, showing good adaptation to the climate conditions.UFBA - Universidade Federal da Bahia2021-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1519-99402021000100501Revista Brasileira de Saúde e Produção Animal v.22 2021reponame:Revista Brasileira de Saúde e Produção Animalinstname:Universidade Federal da Bahia (UFBA)instacron:UFBA10.1590/s1519-99402122022021info:eu-repo/semantics/openAccessSOUTO,Paula Lorena GrangeiraBARBOSA,Eleonara AraújoMARTINS,EdisonMARTINS,Vera Maria VillamilHATAMOTO-ZERVOUDAKIS,Luciana KeikoPIMENTEL,Concepta Margaret McmanusRAMOS,Alexandre Florianieng2021-06-09T00:00:00Zoai:scielo:S1519-99402021000100501Revistahttp://www.rbspa.ufba.br/PUBhttps://old.scielo.br/oai/scielo-oai.php||rbspa@ufba.br1519-99401519-9940opendoar:2021-06-09T00:00Revista Brasileira de Saúde e Produção Animal - Universidade Federal da Bahia (UFBA)false
dc.title.none.fl_str_mv Influence of season and external morphology on thermal comfort and physiological responses in bulls from two breeds adapted to a subtropical climate
title Influence of season and external morphology on thermal comfort and physiological responses in bulls from two breeds adapted to a subtropical climate
spellingShingle Influence of season and external morphology on thermal comfort and physiological responses in bulls from two breeds adapted to a subtropical climate
SOUTO,Paula Lorena Grangeira
conservation
reproduction
stress
thermography
thermoregulation
title_short Influence of season and external morphology on thermal comfort and physiological responses in bulls from two breeds adapted to a subtropical climate
title_full Influence of season and external morphology on thermal comfort and physiological responses in bulls from two breeds adapted to a subtropical climate
title_fullStr Influence of season and external morphology on thermal comfort and physiological responses in bulls from two breeds adapted to a subtropical climate
title_full_unstemmed Influence of season and external morphology on thermal comfort and physiological responses in bulls from two breeds adapted to a subtropical climate
title_sort Influence of season and external morphology on thermal comfort and physiological responses in bulls from two breeds adapted to a subtropical climate
author SOUTO,Paula Lorena Grangeira
author_facet SOUTO,Paula Lorena Grangeira
BARBOSA,Eleonara Araújo
MARTINS,Edison
MARTINS,Vera Maria Villamil
HATAMOTO-ZERVOUDAKIS,Luciana Keiko
PIMENTEL,Concepta Margaret Mcmanus
RAMOS,Alexandre Floriani
author_role author
author2 BARBOSA,Eleonara Araújo
MARTINS,Edison
MARTINS,Vera Maria Villamil
HATAMOTO-ZERVOUDAKIS,Luciana Keiko
PIMENTEL,Concepta Margaret Mcmanus
RAMOS,Alexandre Floriani
author2_role author
author
author
author
author
author
dc.contributor.author.fl_str_mv SOUTO,Paula Lorena Grangeira
BARBOSA,Eleonara Araújo
MARTINS,Edison
MARTINS,Vera Maria Villamil
HATAMOTO-ZERVOUDAKIS,Luciana Keiko
PIMENTEL,Concepta Margaret Mcmanus
RAMOS,Alexandre Floriani
dc.subject.por.fl_str_mv conservation
reproduction
stress
thermography
thermoregulation
topic conservation
reproduction
stress
thermography
thermoregulation
description ABSTRACT Animals in subtropical regions can be exposed to periods of thermal stress. Locally adapted breeds are especially important in this context, but these have little information available in their natural environments. The aim of this study was to assess whether season affects thermal comfort and physiological responses to increased temperatures of two breeds of bulls in a subtropical climate. Four Angus and four Crioulo Lageano bulls were used in this study. Body and testicles measurements, skin pigmentation and thickness, hair number, length and pigmentation, respiratory rate, panting score, rectal temperature and haematological profile were recorded on three occasions in summer and winter, morning and afternoon. The surface temperature of the flank, eye and scrotum were obtained by infrared thermography. Hair coat colour was determined by CIELAB method. Thermal comfort indexes were calculated from meteorological data. Statistical analysis included analyses of variance, correlations and a partial least squares regression in determining which traits were the most important in thermal adaptability. External morphology of the bulls was important for explaining physiological changes in both seasons, but their contribution was greater in summer. Bulls experienced moderate heat stress in summer, which led to significant physiological responses, which were more pronounced in Angus bulls. The main differences in thermal adaptation found between breeds were the hair coat characteristics and respiratory rate. Despite using different mechanisms to cope with environmental challenges, all bulls were able to maintain optimal testicular thermoregulation as well as systemic normothermia throughout the seasons, showing good adaptation to the climate conditions.
publishDate 2021
dc.date.none.fl_str_mv 2021-01-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
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dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1519-99402021000100501
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dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/s1519-99402122022021
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dc.publisher.none.fl_str_mv UFBA - Universidade Federal da Bahia
publisher.none.fl_str_mv UFBA - Universidade Federal da Bahia
dc.source.none.fl_str_mv Revista Brasileira de Saúde e Produção Animal v.22 2021
reponame:Revista Brasileira de Saúde e Produção Animal
instname:Universidade Federal da Bahia (UFBA)
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instname_str Universidade Federal da Bahia (UFBA)
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institution UFBA
reponame_str Revista Brasileira de Saúde e Produção Animal
collection Revista Brasileira de Saúde e Produção Animal
repository.name.fl_str_mv Revista Brasileira de Saúde e Produção Animal - Universidade Federal da Bahia (UFBA)
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