Short-term testicular warming under anesthesia causes similar increases in testicular blood flow in Bos taurus versus Bos indicus bulls, but no apparent hypoxia

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Autor(es): dc.contributorUniversity of Calgary-
Autor(es): dc.contributorUniversidade Estadual Paulista (Unesp)-
Autor(es): dc.contributorExperimental Research Unit-
Autor(es): dc.creatorRizzoto, G.-
Autor(es): dc.creatorFerreira, J. C.P. [UNESP]-
Autor(es): dc.creatorMogollón Garcia, H. D. [UNESP]-
Autor(es): dc.creatorTeixeira-Neto, F. J. [UNESP]-
Autor(es): dc.creatorBardella, L. C.-
Autor(es): dc.creatorMartins, C. L. [UNESP]-
Autor(es): dc.creatorSilva, J. R.B. [UNESP]-
Autor(es): dc.creatorThundathil, J. C.-
Autor(es): dc.creatorKastelic, J. P.-
Data de aceite: dc.date.accessioned2022-02-22T00:29:05Z-
Data de disponibilização: dc.date.available2022-02-22T00:29:05Z-
Data de envio: dc.date.issued2020-12-11-
Data de envio: dc.date.issued2020-12-11-
Data de envio: dc.date.issued2020-03-15-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1016/j.theriogenology.2020.01.045-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/200014-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/200014-
Descrição: dc.descriptionBull testes must be 4–5 °C below body temperature, with testicular warming more likely to cause poor-quality sperm in Bos taurus (European/British) versus Bos indicus (Indian/zebu) bulls. Despite a long-standing dogma that testicular hyperthermia causes hypoxia, we reported that increasing testicular temperature in bulls and rams enhanced testicular blood flow and O2 delivery/uptake, without hypoxia. Our objective was to determine effects of short-term testicular hyperthermia on testicular blood flow, O2 delivery and uptake and evidence of testicular hypoxia in pubertal Angus (B. taurus) and Nelore (B. indicus) bulls (nine per breed) under isoflurane anesthesia. As testes were warmed from 34 to 40 °C, there were increases (P < 0.0001, but no breed effects) in testicular blood flow (mean ± SEM, 9.59 ± 0.10 vs 17.67 ± 0.29 mL/min/100 g, respectively), O2 delivery (1.79 ± 0.06 vs 3.44 ± 0.11 mL O2/min/100 g) and O2 consumption (0.69 ± 0.07 vs 1.25 ± 0.54 mL O2/min/100 g), but no indications of testicular hypoxia. Hypotheses that: 1) both breeds increase testicular blood flow in response to testicular warming; and 2) neither breed has testicular hypoxia, were supported; however, the hypothesis that the relative increase in blood flow is greater in Angus versus Nelore was not supported. Although these were short-term increases in testicular temperature in anesthetized bulls, results did not support the long-standing dogma that increased testicular temperature does not increase testicular blood flow and an ensuing hypoxia is responsible for decreases in motile, morphologically normal and fertile sperm.-
Descrição: dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)-
Descrição: dc.descriptionNatural Sciences and Engineering Research Council of Canada-
Descrição: dc.descriptionDepartment of Production Animal Health Faculty of Veterinary Medicine University of Calgary-
Descrição: dc.descriptionDepartment of Animal Reproduction and Veterinary Radiology School of Veterinary Medicine and Animal Science São Paulo State University (UNESP)-
Descrição: dc.descriptionDepartment of Veterinary Surgery and Anesthesiology School of Veterinary Medicine and Animal Science São Paulo State University (UNESP)-
Descrição: dc.descriptionSchool of Medicine Experimental Research Unit-
Descrição: dc.descriptionDepartment of Animal Breeding and Nutrition School of Veterinary Medicine and Animal Science São Paulo State University (UNESP)-
Descrição: dc.descriptionDepartment of Animal Reproduction and Veterinary Radiology School of Veterinary Medicine and Animal Science São Paulo State University (UNESP)-
Descrição: dc.descriptionDepartment of Veterinary Surgery and Anesthesiology School of Veterinary Medicine and Animal Science São Paulo State University (UNESP)-
Descrição: dc.descriptionDepartment of Animal Breeding and Nutrition School of Veterinary Medicine and Animal Science São Paulo State University (UNESP)-
Descrição: dc.descriptionFAPESP: #2018/02007-6-
Descrição: dc.descriptionNatural Sciences and Engineering Research Council of Canada: RGPIN-2019-04823-
Formato: dc.format94-99-
Idioma: dc.languageen-
Relação: dc.relationTheriogenology-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectHeat stress-
Palavras-chave: dc.subjectTesticular thermoregulation-
Palavras-chave: dc.subjectTissue oxygenation-
Palavras-chave: dc.subjectTissue perfusion-
Título: dc.titleShort-term testicular warming under anesthesia causes similar increases in testicular blood flow in Bos taurus versus Bos indicus bulls, but no apparent hypoxia-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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