Abstract
With the purpose of studying the effect of climate through the global wet bulb index (WBGTi), on the seminal quality of Quarter Horse stallions, in a farm in Tuxtlas, Veracruz, in a tropical environment, meteorological variables, ambient temperature and relative humidity, were evaluated for nine years (2013-2021), to determine the daily and monthly average HTGBH and relate it to the macroscopic (volume) and microscopic characteristics (percentage of mobility, vitality, normal sperm and concentration spermatic) from semen obtained from five stallions. There was an environment of thermal comfort from December to February (íTGBH≤26.99), within the thermo-neutral zone of the horses; while from April to July it was thermally stressful (íTGBH=32.99 to 36.80); with a significant difference (p≤0.05) in the percentage of mobility (75.21±2.58 vs 62.79±2.51), vitality (80.50±2.03 vs 71.10±3.42) and normal sperm (68.80±1.55 vs 58.02±2.0), being lower during the hottest period. Sperm volume and concentration were not influenced by the increase in the index but were influenced by seasonality. It is concluded that the increase in heat, measured in terms of íTGBH, had a negative effect on the seminal quality of stallions.
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