Climatic seasons and time of the day influence thermoregulation and testicular hemodynamics in Santa Inês rams raised under humid tropical conditions

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Autor(es): dc.contributorFederal University of Viçosa-
Autor(es): dc.contributorEmpresa Brasileira de Pesquisa Agropecuária (EMBRAPA)-
Autor(es): dc.contributorFederal Rural University of Amazon-
Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.creatorRodrigues, Juliana Nascimento Duarte-
Autor(es): dc.creatorGuimarães, José Domingos-
Autor(es): dc.creatorFonseca, Jeferson Ferreira-
Autor(es): dc.creatorPenitente-Filho, Jurandy Mauro-
Autor(es): dc.creatorRangel, Paulo Sergio Cerqueira-
Autor(es): dc.creatorLópez, Camilo José Ramírez-
Autor(es): dc.creatorFreitas, Rafael Souza-
Autor(es): dc.creatorCastilho, Erick Fonseca de-
Autor(es): dc.creatorRodrigues, Luiz Fernando de Souza-
Autor(es): dc.creatorOliveira, Maria Emilia Franco-
Autor(es): dc.creatorGarcia, Alexandre Rossetto-
Data de aceite: dc.date.accessioned2025-08-21T23:06:08Z-
Data de disponibilização: dc.date.available2025-08-21T23:06:08Z-
Data de envio: dc.date.issued2023-07-29-
Data de envio: dc.date.issued2023-07-29-
Data de envio: dc.date.issued2023-05-01-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1016/j.jtherbio.2023.103546-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/247110-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/247110-
Descrição: dc.descriptionThis 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.-
Descrição: dc.descriptionDepartment of Veterinary Medicine Federal University of Viçosa, Av. Peter Henry Rolfs, s/n, MG-
Descrição: dc.descriptionEmbrapa Goats and Sheep, Estrada Sobral/Groaíras, km 04, PO Box 145, CE-
Descrição: dc.descriptionInstitute of Animal Health and Production Federal Rural University of Amazon, Avenida Presidente Tancredo Neves, 2501, PA-
Descrição: dc.descriptionDepartment 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, SP-
Descrição: dc.descriptionAnimal Reproduction Biotechnology Laboratory Embrapa Southeast Livestock, Rod Washington Luiz, km 234, SP-
Descrição: dc.descriptionDepartment 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, SP-
Idioma: dc.languageen-
Relação: dc.relationJournal of Thermal Biology-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectDoppler ultrasound-
Palavras-chave: dc.subjectHair sheep-
Palavras-chave: dc.subjectSpermatic cord-
Palavras-chave: dc.subjectTesticular thermoregulation-
Título: dc.titleClimatic seasons and time of the day influence thermoregulation and testicular hemodynamics in Santa Inês rams raised under humid tropical conditions-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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