Climatic seasons and time of the day influence thermoregulation and testicular hemodynamics in Santa Inês rams raised under humid tropical conditions
Autor(a) principal: | |
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Data de Publicação: | 2023 |
Outros Autores: | , , , , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1016/j.jtherbio.2023.103546 http://hdl.handle.net/11449/247110 |
Resumo: | This study evaluated the possible association between the diurnal variations of climatic factors during the rainy (RS) or less rainy (LS) seasons on the testicular hemodynamics and thermoregulatory responses of hair sheep rams raised in a humid tropical climate. Santa Inês rams (n = 6) underwent evaluation of general and testicular physiological parameters (heart and respiratory rates, internal and scrotal temperatures, internal-scrotal temperature gradient, scrotal distention, and color Doppler ultrasound evaluation of the spermatic cords and spectral analyses of testicular arteries) over six consecutive weeks per season at three separate times daily (morning = 8:00 a.m., noon = 12:00 p.m., and afternoon = 5:00 p.m.) during the RS and LS. Climatic air temperature and relative humidity data were recorded, and the temperature and humidity index (THI) was calculated. Higher thermal challenge was observed in LS relative to RS (air temperature = 28.0 vs. 30.9 °C; relative humidity = 84.1 vs. 69.9%; THI = 80.0 vs. 82.5; P < 0.05). In both seasons, respiratory rate and internal temperature were normal, demonstrating the animals’ adaptability. In RS, however, a higher scrotal temperature was recorded in relation to LS (35.0 vs. 34.7 °C; P < 0.05), with a gradual increase from morning to afternoon. Lower resistivity (0.40 vs. 0.64; P < 0.05) and pulsatility (0.55 vs. 1.14; P < 0.05) indices, and a higher rate of high-velocity blood flow of testicular arteries (71.1 vs. 60.6%; P < 0.05) were observed in RS compared to LS. The lowest correlations between testicular hemodynamic, physiological variables, and environmental parameters (P < 0.05) were observed in the morning. In conclusion, testicular thermoregulation and testicular hemodynamics were influenced by the climatic seasons and time of the day, being more efficient in the LS season and with less interference from environmental factors in the morning. |
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Climatic seasons and time of the day influence thermoregulation and testicular hemodynamics in Santa Inês rams raised under humid tropical conditionsDoppler ultrasoundHair sheepSpermatic cordTesticular thermoregulationThis study evaluated the possible association between the diurnal variations of climatic factors during the rainy (RS) or less rainy (LS) seasons on the testicular hemodynamics and thermoregulatory responses of hair sheep rams raised in a humid tropical climate. Santa Inês rams (n = 6) underwent evaluation of general and testicular physiological parameters (heart and respiratory rates, internal and scrotal temperatures, internal-scrotal temperature gradient, scrotal distention, and color Doppler ultrasound evaluation of the spermatic cords and spectral analyses of testicular arteries) over six consecutive weeks per season at three separate times daily (morning = 8:00 a.m., noon = 12:00 p.m., and afternoon = 5:00 p.m.) during the RS and LS. Climatic air temperature and relative humidity data were recorded, and the temperature and humidity index (THI) was calculated. Higher thermal challenge was observed in LS relative to RS (air temperature = 28.0 vs. 30.9 °C; relative humidity = 84.1 vs. 69.9%; THI = 80.0 vs. 82.5; P < 0.05). In both seasons, respiratory rate and internal temperature were normal, demonstrating the animals’ adaptability. In RS, however, a higher scrotal temperature was recorded in relation to LS (35.0 vs. 34.7 °C; P < 0.05), with a gradual increase from morning to afternoon. Lower resistivity (0.40 vs. 0.64; P < 0.05) and pulsatility (0.55 vs. 1.14; P < 0.05) indices, and a higher rate of high-velocity blood flow of testicular arteries (71.1 vs. 60.6%; P < 0.05) were observed in RS compared to LS. The lowest correlations between testicular hemodynamic, physiological variables, and environmental parameters (P < 0.05) were observed in the morning. In conclusion, testicular thermoregulation and testicular hemodynamics were influenced by the climatic seasons and time of the day, being more efficient in the LS season and with less interference from environmental factors in the morning.Department of Veterinary Medicine Federal University of Viçosa, Av. Peter Henry Rolfs, s/n, MGEmbrapa Goats and Sheep, Estrada Sobral/Groaíras, km 04, PO Box 145, CEInstitute of Animal Health and Production Federal Rural University of Amazon, Avenida Presidente Tancredo Neves, 2501, PADepartment of Pathology Reproduction and One Health School of Agricultural and Veterinarian Sciences São Paulo State University, Via de Acesso Prof. Paulo Donato Castellane, s/n, SPAnimal Reproduction Biotechnology Laboratory Embrapa Southeast Livestock, Rod Washington Luiz, km 234, SPDepartment of Pathology Reproduction and One Health School of Agricultural and Veterinarian Sciences São Paulo State University, Via de Acesso Prof. Paulo Donato Castellane, s/n, SPFederal University of ViçosaEmpresa Brasileira de Pesquisa Agropecuária (EMBRAPA)Federal Rural University of AmazonUniversidade Estadual Paulista (UNESP)Rodrigues, Juliana Nascimento DuarteGuimarães, José DomingosFonseca, Jeferson FerreiraPenitente-Filho, Jurandy MauroRangel, Paulo Sergio CerqueiraLópez, Camilo José RamírezFreitas, Rafael SouzaCastilho, Erick Fonseca deRodrigues, Luiz Fernando de SouzaOliveira, Maria Emilia Franco [UNESP]Garcia, Alexandre Rossetto2023-07-29T13:06:34Z2023-07-29T13:06:34Z2023-05-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://dx.doi.org/10.1016/j.jtherbio.2023.103546Journal of Thermal Biology, v. 114.1879-09920306-4565http://hdl.handle.net/11449/24711010.1016/j.jtherbio.2023.1035462-s2.0-85151620145Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengJournal of Thermal Biologyinfo:eu-repo/semantics/openAccess2023-07-29T13:06:34Zoai:repositorio.unesp.br:11449/247110Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462023-07-29T13:06:34Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Climatic seasons and time of the day influence thermoregulation and testicular hemodynamics in Santa Inês rams raised under humid tropical conditions |
title |
Climatic seasons and time of the day influence thermoregulation and testicular hemodynamics in Santa Inês rams raised under humid tropical conditions |
spellingShingle |
Climatic seasons and time of the day influence thermoregulation and testicular hemodynamics in Santa Inês rams raised under humid tropical conditions Rodrigues, Juliana Nascimento Duarte Doppler ultrasound Hair sheep Spermatic cord Testicular thermoregulation |
title_short |
Climatic seasons and time of the day influence thermoregulation and testicular hemodynamics in Santa Inês rams raised under humid tropical conditions |
title_full |
Climatic seasons and time of the day influence thermoregulation and testicular hemodynamics in Santa Inês rams raised under humid tropical conditions |
title_fullStr |
Climatic seasons and time of the day influence thermoregulation and testicular hemodynamics in Santa Inês rams raised under humid tropical conditions |
title_full_unstemmed |
Climatic seasons and time of the day influence thermoregulation and testicular hemodynamics in Santa Inês rams raised under humid tropical conditions |
title_sort |
Climatic seasons and time of the day influence thermoregulation and testicular hemodynamics in Santa Inês rams raised under humid tropical conditions |
author |
Rodrigues, Juliana Nascimento Duarte |
author_facet |
Rodrigues, Juliana Nascimento Duarte Guimarães, José Domingos Fonseca, Jeferson Ferreira Penitente-Filho, Jurandy Mauro Rangel, Paulo Sergio Cerqueira López, Camilo José Ramírez Freitas, Rafael Souza Castilho, Erick Fonseca de Rodrigues, Luiz Fernando de Souza Oliveira, Maria Emilia Franco [UNESP] Garcia, Alexandre Rossetto |
author_role |
author |
author2 |
Guimarães, José Domingos Fonseca, Jeferson Ferreira Penitente-Filho, Jurandy Mauro Rangel, Paulo Sergio Cerqueira López, Camilo José Ramírez Freitas, Rafael Souza Castilho, Erick Fonseca de Rodrigues, Luiz Fernando de Souza Oliveira, Maria Emilia Franco [UNESP] Garcia, Alexandre Rossetto |
author2_role |
author author author author author author author author author author |
dc.contributor.none.fl_str_mv |
Federal University of Viçosa Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA) Federal Rural University of Amazon Universidade Estadual Paulista (UNESP) |
dc.contributor.author.fl_str_mv |
Rodrigues, Juliana Nascimento Duarte Guimarães, José Domingos Fonseca, Jeferson Ferreira Penitente-Filho, Jurandy Mauro Rangel, Paulo Sergio Cerqueira López, Camilo José Ramírez Freitas, Rafael Souza Castilho, Erick Fonseca de Rodrigues, Luiz Fernando de Souza Oliveira, Maria Emilia Franco [UNESP] Garcia, Alexandre Rossetto |
dc.subject.por.fl_str_mv |
Doppler ultrasound Hair sheep Spermatic cord Testicular thermoregulation |
topic |
Doppler ultrasound Hair sheep Spermatic cord Testicular thermoregulation |
description |
This study evaluated the possible association between the diurnal variations of climatic factors during the rainy (RS) or less rainy (LS) seasons on the testicular hemodynamics and thermoregulatory responses of hair sheep rams raised in a humid tropical climate. Santa Inês rams (n = 6) underwent evaluation of general and testicular physiological parameters (heart and respiratory rates, internal and scrotal temperatures, internal-scrotal temperature gradient, scrotal distention, and color Doppler ultrasound evaluation of the spermatic cords and spectral analyses of testicular arteries) over six consecutive weeks per season at three separate times daily (morning = 8:00 a.m., noon = 12:00 p.m., and afternoon = 5:00 p.m.) during the RS and LS. Climatic air temperature and relative humidity data were recorded, and the temperature and humidity index (THI) was calculated. Higher thermal challenge was observed in LS relative to RS (air temperature = 28.0 vs. 30.9 °C; relative humidity = 84.1 vs. 69.9%; THI = 80.0 vs. 82.5; P < 0.05). In both seasons, respiratory rate and internal temperature were normal, demonstrating the animals’ adaptability. In RS, however, a higher scrotal temperature was recorded in relation to LS (35.0 vs. 34.7 °C; P < 0.05), with a gradual increase from morning to afternoon. Lower resistivity (0.40 vs. 0.64; P < 0.05) and pulsatility (0.55 vs. 1.14; P < 0.05) indices, and a higher rate of high-velocity blood flow of testicular arteries (71.1 vs. 60.6%; P < 0.05) were observed in RS compared to LS. The lowest correlations between testicular hemodynamic, physiological variables, and environmental parameters (P < 0.05) were observed in the morning. In conclusion, testicular thermoregulation and testicular hemodynamics were influenced by the climatic seasons and time of the day, being more efficient in the LS season and with less interference from environmental factors in the morning. |
publishDate |
2023 |
dc.date.none.fl_str_mv |
2023-07-29T13:06:34Z 2023-07-29T13:06:34Z 2023-05-01 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1016/j.jtherbio.2023.103546 Journal of Thermal Biology, v. 114. 1879-0992 0306-4565 http://hdl.handle.net/11449/247110 10.1016/j.jtherbio.2023.103546 2-s2.0-85151620145 |
url |
http://dx.doi.org/10.1016/j.jtherbio.2023.103546 http://hdl.handle.net/11449/247110 |
identifier_str_mv |
Journal of Thermal Biology, v. 114. 1879-0992 0306-4565 10.1016/j.jtherbio.2023.103546 2-s2.0-85151620145 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Journal of Thermal Biology |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1799965702266814464 |