Duncan I J, Slee G S, Kettlewell P, Berry P, Carlisle A J
Br Poult Sci. 1986 Mar;27(1):109-14. doi: 10.1080/00071668608416861.
The procedures of manual and machine catching acted as short-term stressors, and induced a state of fear in 8-week-old broiler chickens. The heart rate of birds caught by both methods rose to similar high values but that of birds caught by machine returned to near normal rates more quickly, suggesting that they were less stressed. The duration of tonic immobility, a response which increases with fearfulness, was much longer in manually-caught birds. These results suggest that stress could be reduced and welfare improved by catching and picking up broiler chickens by a carefully designed machine, rather than by hand.
人工抓捕和机器抓捕的操作作为短期应激源，在8周龄的肉鸡中诱发了恐惧状态。两种方法抓捕的鸡的心率都上升到了相似的较高值，但机器抓捕的鸡的心率更快恢复到接近正常水平，这表明它们的应激较小。强直静止的持续时间（一种随恐惧程度增加而增加的反应）在人工抓捕的鸡中要长得多。这些结果表明，通过精心设计的机器而非手工来抓捕和抓取肉鸡，可以减轻应激并改善福利。
