Influence of season and external morphology on thermal comfort and physiological responses in bulls from two breeds adapted to a subtropical climate
Autor(a) principal: | |
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Data de Publicação: | 2021 |
Outros Autores: | , , , , , |
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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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 |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1519-99402021000100501 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1519-99402021000100501 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/s1519-99402122022021 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
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) instacron:UFBA |
instname_str |
Universidade Federal da Bahia (UFBA) |
instacron_str |
UFBA |
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) |
repository.mail.fl_str_mv |
||rbspa@ufba.br |
_version_ |
1750297508898144256 |