Kotrbácek V
Department of Animal Physiology, University of Veterinary Sciences, Brno, Czech and Slovak Republic.
Acta Vet Hung. 1991;39(3-4):115-20.
The duration and type of sleep and activity were monitored in a group of 9 Duroc piglets weaned at 7 weeks of age and placed into a cage of 1.2 x 1.2 m. Average air temperature in the cage ranged between 20 and 23 degrees C and relative humidity was around 70%. The piglets were fed and watered ad libitum. The measurements were performed one week after the pigs had been transferred to the cages, in the period between 8 a.m. and 1 p.m. Approximately half of the 5-hour period of observation was occupied by sleep. There were, however, marked individual differences (ranges: 66 and 24%). Non-REM sleep occupied 79% while REM sleep 21% of the whole sleep time. REM episodes lasted, on the average, 3.8 + 0.58 min. The other half of the period studied was occupied by wakefulness which was devoted to movement, lying and, also, massaging and sucking each other. In some animals this activity was high and was the cause of unrest in the whole group. Differences in respiratory rate between non-REM and REM sleep recorded in heavier animals were the result of their heat load.
对一组9只7周龄断奶的杜洛克仔猪进行了睡眠和活动的时长及类型监测，这些仔猪被安置在一个1.2×1.2米的笼子里。笼子里的平均气温在20至23摄氏度之间，相对湿度约为70%。仔猪自由采食和饮水。在猪被转移到笼子一周后，于上午8点至下午1点期间进行测量。在5小时的观察期内，大约一半时间被睡眠占据。然而，个体差异明显（范围：66%和24%）。非快速眼动睡眠占整个睡眠时间的79%，而快速眼动睡眠占21%。快速眼动睡眠阶段平均持续3.8±0.58分钟。研究时段的另一半时间被清醒状态占据，清醒时仔猪进行活动、躺卧，还会相互按摩和吮舔。在一些仔猪中，这种活动很频繁，导致整个群体不安。较重的仔猪在非快速眼动睡眠和快速眼动睡眠之间记录到的呼吸频率差异是其热负荷的结果。
