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Since mitochondria are the primary source of reactive oxygen species (ROS), HS-mediated OS may be lessened by targeting mitochondria with particular antioxidants. The purpose of this study was to investigate the effect of oral coenzyme Q10 (CoQ10) supplementation on the reproductive performance of goat bucks under HS conditions. Ten mature bucks were randomly separated into two groups and housed in an environment with a high-temperature humidity index (THI: 88.3 to 94.8; summer season). The first group (<jats:italic>n<\/jats:italic>\u2009=\u20095) got the baseline diet while the second group (<jats:italic>n<\/jats:italic>\u2009=\u20095) received supplemental oral CoQ10 (3\u00a0mg\/kg BW; CoQ10 group) daily for six weeks. Testicular blood flow parameters (TBF), testicular volume (TV) and echogenicity (TE), nitric oxide (NO), seminal alanine aminotransferase (ALT) and catalase (CAT) activities, total antioxidant capacity (TAC), malondialdehyde (MDA) content, and semen quality traits were all measured. The examinations started a week before (W-1), on the first supplementation day (W0), and weekly for eight consecutive weeks (W1-W8). There were marked <jats:italic>(P<\/jats:italic>\u2009&lt;\u2009<jats:italic>0.05)<\/jats:italic> increases in TBF (W3-W6) and TV, and a decrease in TE (W3-W5) in the CoQ10 group compared to the CON group. Similarly, testosterone (T) and NO levels (W3-W5) in the CoQ10 group were higher <jats:italic>(P<\/jats:italic>\u2009&lt;\u2009<jats:italic>0.05)<\/jats:italic> than those of the control group. The CoQ10 group demonstrated significant <jats:italic>(P<\/jats:italic>\u2009&lt;\u20090.05) increases in seminal CAT (W4-W8) and TAC (W2-W6) activities and decreases in ALT (W4-W7) activity and MDA (W5-W8) concentration as compared to the control group. The CoQ10 group showed improvements <jats:italic>(P<\/jats:italic>\u2009&lt;\u20090.05) at W3-W6 for sperm progressive motility, viability, and normal morphology and at W6-W8 for sperm concentration. In conclusion, oral CoQ10 supplementation improved testicular hemodynamics, testosterone production, semen quality, and antioxidant capacity in goat bucks during summer heat stress conditions.<\/jats:p>","DOI":"10.1007\/s11259-022-09991-8","type":"journal-article","created":{"date-parts":[[2022,9,1]],"date-time":"2022-09-01T15:04:46Z","timestamp":1662044686000},"page":"1245-1257","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":32,"title":["Coenzyme Q10 Supplementation enhances testicular volume and hemodynamics, reproductive hormones, sperm quality, and seminal antioxidant capacity in goat bucks under summer hot humid conditions"],"prefix":"10.1007","volume":"46","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0069-9926","authenticated-orcid":false,"given":"Hossam R.","family":"El-Sherbiny","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Elshymaa A.","family":"Abdelnaby","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"K. 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