Swiergiel A H, Ingram D L
Physiol Behav. 1986;36(4):637-42. doi: 10.1016/0031-9384(86)90346-x.
Piglets were weaned at 14 days and acclimated to 10 or 35 degrees C and kept either on a low or a high plant of nutrition. After 2 and 3 weeks of acclimation their operant thermoregulatory behaviour was observed at 15 degrees C. The pigs which had been living at 10 degrees C obtained more radiant heat than those from 35 degrees C and the animals on a low energy intake obtained more reinforcements than those on a high intake. There was no interaction between temperature and diet indicating that these two variables exerted their influence independently. Pigs tested 22 hr after a meal obtained more heat than when tested 1 hr after a meal. Rectal temperature before the test was significantly lower in the animals reared at 10 than at 35 degrees C, but the difference had disappeared at the end of the trial. By contrast, the pigs kept on different planes of nutrition had the same rectal temperatures before the test trial but afterwards the animals on a high diet had higher rectal temperatures. Body temperatures seemed to be the factor which influenced the demand for heat. The role of thermal comfort, body size, diet induced thermogenesis and separate sets of controls for autonomic and behavioural thermoregulatory responses in operant thermoregulatory behaviour is discussed.
仔猪在14日龄时断奶，适应10摄氏度或35摄氏度的环境，并分别饲养在低营养或高营养水平的饲料中。适应2周和3周后，在15摄氏度下观察它们的操作性体温调节行为。生活在10摄氏度环境中的猪比生活在35摄氏度环境中的猪获得更多的辐射热，能量摄入低的动物比能量摄入高的动物获得更多的强化。温度和饮食之间没有相互作用，表明这两个变量的影响是独立的。餐后22小时进行测试的猪比餐后1小时进行测试的猪获得更多的热量。测试前，饲养在10摄氏度环境中的动物直肠温度显著低于饲养在35摄氏度环境中的动物，但在试验结束时差异消失。相比之下，处于不同营养水平的猪在测试前直肠温度相同，但之后高营养饮食的动物直肠温度更高。体温似乎是影响热量需求的因素。文中讨论了热舒适、体型、饮食诱导的产热以及自主和行为体温调节反应在操作性体温调节行为中的不同控制机制的作用。
