This study was designed to evaluate the effects of electronically controlled cooling pads on measures of physiological responses in HS gilts. The study utilized 12 gilts randomly assigned into one of three treatment groups [Control(CN), flush 2.0 L cool water over 30 s every 4 min(F4), or flush 2.0 L over 30 s every 8 min(F8)] in a Latin Square design and replicated 12 times(2 repetitions/d over 6 d). Gilts were housed in farrowing crates and fed 1.2 kg at 0700 and 1300 h daily. On d 1 to 3(6 repetitions) the room was gradually heated from 18ºC to 32ºC, while on d 4 to 6 the room was gradually heated from 18ºC to 35ºC starting at 0730 or 1330 h. Once the temperature was achieved, cooling pads were turned on and the temperature was maintained for 2.5 h. Two baseline measurements were taken of respiration rates(RR), skin temperature through thermal imaging(IRTemp), and vaginal temperature(VTemp) before room heating began and then recorded every 20 minutes after pads were turned on. Measurements at the end of HS(PostH) and the change in values during the HS period(DIFF) were evaluated using PROC mixed of SAS. Gilts in F4 and F8 had lower RR than CN for PostH for both 32ºC and 35ºC (P< .05). DIFF in RR was less in F4 and F8 than in CN[(32ºC, P=.097) and (35ºC, P=.005)]. There was a tendency for DIFF in Vtemp at 32ºC between treatments (P=.064) but had no effect by treatment for PostH (P=.534). There was no effect in PostH and DIFF for IRTemp between treatments for 32ºC and 35ºC. PostH and DIFF for VTemp were significant at 35ºC (P=.009 and P=.001). PostH for RR was different at 35 ºC and 32 ºC (P=.0074; P=.0472) with F4 and F8 lesser and CN. In conclusion, cooling pads, regardless of flush rate, had positive impacts on physiological indicators of HS.

中文翻译：

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PSI-11 对热应激后备母猪电子控制冷却垫冲洗率的评估

本研究旨在评估电子控制冷却垫对 HS 后备母猪生理反应测量的影响。该研究使用了 12 头后备母猪，随机分配到三个处理组之一[对照组（CN），每 4 分钟冲洗 2.0 升冷水超过 30 秒（F4），或每 8 分钟冲洗 2.0 升超过 30 秒（F8）]拉丁方设计并重复 12 次（2 次重复/d 超过 6 d）。后备母猪被圈养在产仔箱中，每天 0700 和 1300 小时饲喂 1.2 公斤。在第 1 天到第 3 天（重复 6 次），房间逐渐从 18ºC 加热到 32ºC，而在第 4 天到第 6 天，房间从 0730 或 1330 小时开始逐渐从 18ºC 加热到 35ºC。达到温度后，打开冷却垫并将温度保持 2.5 小时。对呼吸率（RR）进行了两次基线测量，通过热成像（IRTemp）和阴道温度（VTemp）在房间加热开始之前通过热成像测量皮肤温度（VTemp），然后在垫打开后每20分钟记录一次。使用 SAS 混合的 PROC 评估 HS 结束时的测量值（PostH）和 HS 期间的值变化（DIFF）。F4 和 F8 后备母猪在 32ºC 和 35ºC 的 PostH RR 低于 CN（P<0.05）。F4 和 F8 中 RR 的 DIFF 小于 CN[(32ºC, P=.097) 和 (35ºC, P=.005)]。处理之间在 32ºC 时 Vtemp 有 DIFF 趋势（P=.064），但对 PostH 处理没有影响（P=.534）。在 32ºC 和 35ºC 处理之间，对 IRTemp 的 PostH 和 DIFF 没有影响。VTemp 的 PostH 和 DIFF 在 35ºC 时显着（P=.009 和 P=.001）。RR 的 PostH 在 35 ºC 和 32 ºC (P=.0074; P=.0472) 不同，F4 和 F8 较小，CN 较小。