Brake J, Keeley T P, Jones R B
Department of Poultry Science, North Carolina State University, Raleigh 27695-7608.
Poult Sci. 1994 Sep;73(9):1470-4. doi: 10.3382/ps.0731470.
Broiler breeders were housed in pens in an all-litter house with an 8-h photoperiod from hatching to 20 wk of age. They were reared either in the presence or absence of perches (7 cm per bird) and on either a 14% or a 17% CP diet. The duration of the tonic immobility (TI) fear response was measured in 15- and in 20-wk-old birds; each pullet was tested individually and once only. There was an apparent age-related increase in the duration of TI, which was attenuated by the provision of perches during rearing. The results are discussed in terms of maturational and environmental influences on the development and alleviation of fear.
肉种鸡饲养在全垫料鸡舍的鸡笼中，从孵化到20周龄光照周期为8小时。它们在有或没有栖木（每只鸡7厘米）的环境中饲养，并分别饲喂14%或17%粗蛋白的日粮。在15周龄和20周龄的鸡中测量强直静止（TI）恐惧反应的持续时间；每只小母鸡单独测试一次。TI持续时间明显随年龄增长，而饲养期间提供栖木可减弱这种增长。从成熟和环境对恐惧发展及缓解的影响方面对结果进行了讨论。
