Heat stress (HS) decreases semen quality and production in boars. Therefore, the study objective was to evaluate the use of electronically-controlled cooling pads to reduce the negative effects of HS on semen quality. Boars (n=24) were randomly allotted to two treatment groups: boars housed on a non-functional cooling pad (CON) or pads flushing water every 8 minutes or when the pad reached 28.5°C (FLUSH). For 3 d, boars were subjected to cyclical HS (28 to 32°C; >50% relative humidity). Semen was collected for 7 weeks (2 weeks prior to determine baseline semen parameters, the day after HS, and weekly for 4 weeks post HS), and evaluated for volume, sperm concentration, motility, progressive motility, morphology, viability, and kinematic motion parameters. FLUSH boars had higher semen volumes compared to CON (P=0.011) without a corresponding increase in total sperm produced (P=0.852). Boars in FLUSH had higher motility in all weeks (87.0–90.8%) when compared to CON boars. FLUSH boars had higher motility starting in week 4 after HS compared to CON (P=0.017). No differences in progressive motility or kinematic motion parameters were found. There was a tendency for FLUSH boars to have a higher percent normal morphology compared to CON boars (83.1 vs 77.5%, P=0.083) resulting from decreased proximal and distal droplets in the FLUSH boars (P=0.029 and P=.0014, respectively). During week 2 post HS, there was a tendency for FLUSH boars to have a lower percentage of non-viable cells compared to all other weeks for FLUSH and CON boars (P=0.088). Cooling pads were effective at reducing the negative impacts of HS on semen volume, motility, and morphological abnormalities.

中文翻译：

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PSI-9 电子控制地板冷却垫对中度热应激期间公猪精液质量的评估

热应激 (HS) 会降低公猪的精液质量和产量。因此，本研究的目的是评估电子控制冷却垫的使用，以减少 HS 对精液质量的负面影响。公猪 (n=24) 被随机分配到两个处理组：公猪饲养在非功能性冷却垫 (CON) 或垫子上，每 8 分钟冲洗一次水或垫子达到 28.5°C (FLUSH)。3 天，公猪经受周期性 HS（28 至 32°C；＞50% 相对湿度）。收集精液 7 周（确定基线精液参数前 2 周、HS 后第二天和 HS 后 4 周每周），并评估体积、精子浓度、运动性、前进运动性、形态学、活力和运动学运动参数。与 CON 相比，FLUSH 公猪的精液量更高（P=0. 011）没有相应增加产生的总精子（P = 0.852）。与 CON 公猪相比，FLUSH 公猪在所有周内的运动性都更高（87.0-90.8%）。与 CON 相比，从 HS 后第 4 周开始，FLUSH 公猪的运动性更高（P=0.017）。没有发现渐进运动或运动学运动参数的差异。由于 FLUSH 公猪的近端和远端液滴减少（分别为 P=0.029 和 P=.0014 ）。在 HS 后第 2 周，与 FLUSH 和 CON 公猪的所有其他周相比，FLUSH 公猪的非活细胞百分比倾向于较低（P = 0.088）。冷却垫可有效减少 HS 对精液量、活力、