Lee K, Moss C W
Department of Agriculture, University of Arkansas, Pine Bluff 71601, USA.
Poult Sci. 1995 Sep;74(9):1426-30. doi: 10.3382/ps.0741426.
Two experiments were conducted to study the effects of cage density on fear-related behavioral response and activity of White Leghorn layers. In Experiment 1, 20-wk old pullets were placed into 30.5 x 50.8 cm cages at the rate of one, two, three, and four birds per cage for Treatments 1, 2, 3, and 4, respectively. In Experiment 2, birds were placed into cages (30.5 x 50.8 cm) at the rate of one, two, three, four, three, two, and three birds per cage for Treatments 1, 2, 3, 4, 5, 6, and 7, respectively, at 20 wk of age. At 28 wk of age, one bird was removed from each cage in Treatment 5, and one bird was added to each cage in Treatments 6 and 7. Fear-related behavioral response of the birds, as determined by the duration of induced tonic immobility (TI), and bird activity, as determined by the head movement (HM) count, were measured at 52 wk of age in Experiment 1, and at 29, 36, and 52 wk of age in Experiment 2. Increasing cage density had no effect on fear-related response of the birds in both experiments. Cage density effect on bird activity was not consistent. In Experiment 1, HM count was not affected by cage density, whereas in Experiment 2, pullets in the multiple-bird cage had a lower (P < or = .05) HM count (three-period average) than the birds housed individually. There was no correlation between the duration of induced TI and HM count in both experiments.(ABSTRACT TRUNCATED AT 250 WORDS)
进行了两项实验，以研究笼养密度对白色来航蛋鸡恐惧相关行为反应和活动的影响。在实验1中，将20周龄的小母鸡分别以每笼1只、2只、3只和4只的密度放入30.5×50.8厘米的笼子中，分别对应处理1、2、3和4。在实验2中，20周龄时将鸡分别以每笼1只、2只、3只、4只、3只、2只和3只的密度放入笼子（30.5×50.8厘米）中，分别对应处理1、2、3、4、5、6和7。在28周龄时，处理5的每个笼子中取出1只鸡，处理6和7的每个笼子中添加1只鸡。在实验1中，于52周龄时测量鸡的恐惧相关行为反应（通过诱导性强直静止时间（TI）确定）和鸡的活动（通过头部运动（HM）计数确定）；在实验2中，于29周龄、36周龄和52周龄时进行测量。在两项实验中，增加笼养密度对鸡的恐惧相关反应均无影响。笼养密度对鸡活动的影响并不一致。在实验1中，HM计数不受笼养密度影响；而在实验2中，多只鸡笼中的小母鸡的HM计数（三期平均值）低于单独饲养的鸡（P≤0.05）。在两项实验中，诱导性TI的持续时间与HM计数之间均无相关性。（摘要截断于250字）
