5ADAM C,HOGAN J A.The development of feather pecking in Burmese red jungle fowl:the influence of early experience with exploratory-rich environments[J].Appl Anim Behav Sci,2005,93:283-294.
6JOHNSEN P F,VESTERGAARD K S.Dustbathing and pecking behaviour in chicks from a high and low pecking line of laying hens[J].Applied Animal Behavior Science,1996,49:237-246.
7MARC B M,JOHAN J Z,PETRA L.Formalised review of environmental enrichment for pigs in relation to political decision making[J].Applied Animal Behavior Scinece,2006,98:165-182.
8ROGERS L J.The development of brain and behaviour in the chicken[M].CAB international,1995.
9MENCH J,KEELING L J.The social behaviour of domestic birds[J].Social behaviour in farm animals Wallingford:CABI Publishing,2001:177-209.
10KOELKEBECK K W,CAIN J R.Performance,behavior,plasma corticosterone,and economic returns of laying hensin several management alternatives[J].Poultry Science,1984,63:2123-2131.
