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

التفاصيل البيبلوغرافية
العنوان: Short-term testicular warming under anesthesia causes similar increases in testicular blood flow in Bos taurus versus Bos indicus bulls, but no apparent hypoxia.
المؤلفون: Rizzoto G; Department of Production Animal Health, Faculty of Veterinary Medicine, University of Calgary, Calgary, AB, Canada., Ferreira JCP; Department of Animal Reproduction and Veterinary Radiology, School of Veterinary Medicine and Animal Science, São Paulo State University (UNESP), Botucatu, SP, Brazil. Electronic address: joao.cp.ferreira@unesp.br., Mogollón Garcia HD; Department of Animal Reproduction and Veterinary Radiology, School of Veterinary Medicine and Animal Science, São Paulo State University (UNESP), Botucatu, SP, Brazil., Teixeira-Neto FJ; Department of Veterinary Surgery and Anesthesiology, School of Veterinary Medicine and Animal Science, São Paulo State University (UNESP), Botucatu, SP, Brazil., Bardella LC; School of Medicine, Experimental Research Unit, Botucatu, SP, Brazil., Martins CL; Department of Animal Breeding and Nutrition, School of Veterinary Medicine and Animal Science São Paulo State University (UNESP), Botucatu, SP, Brazil., Silva JRB; Department of Veterinary Surgery and Anesthesiology, School of Veterinary Medicine and Animal Science, São Paulo State University (UNESP), Botucatu, SP, Brazil., Thundathil JC; Department of Production Animal Health, Faculty of Veterinary Medicine, University of Calgary, Calgary, AB, Canada., Kastelic JP; Department of Production Animal Health, Faculty of Veterinary Medicine, University of Calgary, Calgary, AB, Canada.
المصدر: Theriogenology [Theriogenology] 2020 Mar 15; Vol. 145, pp. 94-99. Date of Electronic Publication: 2020 Jan 23.
نوع المنشور: Journal Article
اللغة: English
بيانات الدورية: Publisher: Elsevier Country of Publication: United States NLM ID: 0421510 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1879-3231 (Electronic) Linking ISSN: 0093691X NLM ISO Abbreviation: Theriogenology Subsets: MEDLINE
أسماء مطبوعة: Publication: [New York, N.Y.?] : Elsevier
Original Publication: Los Altos, Calif., Geron-X.
مواضيع طبية MeSH: Temperature*, Cattle/*physiology , Oxygen/*metabolism , Testis/*blood supply, Animals ; Body Temperature ; Cattle/genetics ; Male ; Semen/physiology ; Species Specificity ; Sperm Motility ; Spermatozoa/physiology ; Testis/physiology ; Time Factors
مستخلص: Bull 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 O 2 delivery/uptake, without hypoxia. Our objective was to determine effects of short-term testicular hyperthermia on testicular blood flow, O 2 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), O 2 delivery (1.79 ± 0.06 vs 3.44 ± 0.11 mL O 2 /min/100 g) and O 2 consumption (0.69 ± 0.07 vs 1.25 ± 0.54 mL O 2 /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.
Competing Interests: Declaration of competing interest The authors declare that there is no conflict of interest that could be perceived as prejudicing the impartiality of the research reported.
(Copyright © 2020 Elsevier Inc. All rights reserved.)
فهرسة مساهمة: Keywords: Heat stress; Testicular thermoregulation; Tissue oxygenation; Tissue perfusion
المشرفين على المادة: S88TT14065 (Oxygen)
تواريخ الأحداث: Date Created: 20200203 Date Completed: 20210107 Latest Revision: 20210107
رمز التحديث: 20221213
DOI: 10.1016/j.theriogenology.2020.01.045
PMID: 32007637
قاعدة البيانات: MEDLINE
الوصف
تدمد:1879-3231
DOI:10.1016/j.theriogenology.2020.01.045