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Preferred Environmental Temperature of Group-Housed Sows Fed with High Heat-Increment Diets

机译：高热量饮食饲喂群养母猪的首选环境温度

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As the pig industry shifts from stalls towards group housing system for sows, there is a need to re-consider the current lower critical temperature (LCT) values being used in setting temperatures in sow barns considering that sows housed in groups have the potential to exhibit thermoregulatory behavior to maintain comfort even when the temperature in the barn is lowered.In addition, high heat-increment diet increases heat production in sows without increasing digestible energy and can be a means of reducing activity and limiting aggression in group-housed sows under reduced barn temperature.This study aimed to determine the preferred temperature of sows housed in groups and fed with high heat-increment diets.An operant mechanism that allowed the sows to demonstrate their preferred environmental temperature by enabling them to control the operation of the heating and ventilation equipment in the room was designed and developed.Three replicate trials were carried out in two fully controlled-environment chambers.Sows in one chamber were fed with standard gestation diet(Control) while sows in the other chamber were fed with high heat-increment diet (Treatment).Results showed that sows fed with high heat-increment diet could tolerate exposure to lower temperatures better than those fed with a standard gestation diet.Moreover, performance of sows fed with high heat-increment diet seemed to have been less affected by the exposure to colder temperatures compared to those fed with standard diet.
机译：随着养猪业从摊位向母猪的群养系统转变，考虑到成群饲养的母猪有可能表现出潜力，有必要重新考虑当前用于设定母猪舍温度的较低临界温度（LCT）值。温度调节行为即使在降低谷仓温度的情况下也能保持舒适度。此外，高热量饮食可以增加母猪的产热量，而不会增加可消化的能量，并且可以作为降低活动性和限制母猪在低脂状态下侵略的一种手段。谷仓温度：本研究旨在确定成群饲养并饲喂高热量饮食的母猪的首选温度。一种运行机制通过允许母猪控制供暖和通风操作来展示其首选环境温度设计和开发了房间内的设备。在两个完全控制的环境中进行了三个重复试验在一个环境中给母猪饲喂标准的妊娠日粮（对照），在另一个环境中给母猪饲喂高热量的日粮（处理），结果表明，以高热量饮食喂养的母猪可以耐受暴露与标准日粮相比，母猪的性能似乎受到较低温度的影响较小。

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