Seasonal variation in testicular blood flow dynamics and their relation to systemic and testicular oxidant/antioxidant biomarkers and androgens in rams.

Autor: Hedia MG; Department of Theriogenology, Faculty of Veterinary Medicine, Cairo University, Giza, Egypt., El-Belely MS; Department of Theriogenology, Faculty of Veterinary Medicine, Cairo University, Giza, Egypt., Ismail ST; Department of Theriogenology, Faculty of Veterinary Medicine, Cairo University, Giza, Egypt., Abo El-Maaty AM; Department of Animal Reproduction and AI, Veterinary Division, National Research Center, Giza, Egypt.
Jazyk: angličtina
Zdroj: Reproduction in domestic animals = Zuchthygiene [Reprod Domest Anim] 2020 Jul; Vol. 55 (7), pp. 861-869. Date of Electronic Publication: 2020 May 26.
DOI: 10.1111/rda.13696
Abstrakt: The environmental temperature increased during summer and decreased during winter to the limits that might negatively affect animal and human reproduction. The responses of Egyptian rams to either hot or cold climatic conditions were studied in six mature rams subjected to weekly testicular Doppler ultrasonographic examination, blood sampling, seminal plasma collection and semen evaluation. The maximum environmental temperature and the relative humidity were used to classify the climatic condition according to the heat stress equation of sheep into hot months where temperature-humidity index (THI) was >26 (31.67 ± 0.54), and cold months where THI was <22 (18.39 ± 0.41). Testosterone, estradiol, superoxide dismutase (SOD), glutathione peroxidase (GPX) and lipid peroxide product (malondialdehyde, MDA) were measured in both blood and seminal plasma, while catalase (CAT) and reduced glutathione (GSH) were measured in blood and seminal plasma, respectively. Results revealed that, during the hot months, rams displayed significantly decreased testicular blood flow, increased seminal plasma MDA, decreased seminal plasma (SOD, GPx and GSH) and blood CAT antioxidant enzymes. The present study evidenced two novel findings: (a) the marked decrease in testicular blood flow volume, that is remarkable increase in both resistive index (RI) and pulsatility index (PI) values, during hot months could be negatively affected both seminal plasma enzymatic activities and seminal attributes, and (b) the SOD and GPx activities in seminal plasma of such animals were suitable predictive markers for seminal attribute evaluation.
(© 2020 Blackwell Verlag GmbH.)
Databáze: MEDLINE
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