5DOZIER W A,THAXTON J P, PURSWELL J L, et al.Stocking density effects on male broilers grown to 1.8 kilograms of body weight[J]. Poultry Science, 2006,85 ( 2 ) : 344-351.
6MARTRENCHAR A, BOILLETOT E, HUONNIC D, et al. Risk factors for foot-pad dermatitis in chicken and turkey broilers in France[J]. Preventive Veterina- ry Medicine ,2002,52(3/4) :213-226.
7AKPOBOME G O,FANGUY R C.Evaluation of cage floor systems for production of commercial broilers [ J ] .Poultry Science, 1992,71 ( 2 ) :274-280.
8ANDREWS L D, STAMPS L K,MOORE R W, et al. Effects of different floor types and levels of washing of waterers on broiler performance and bacteria count of drinking water[ J] .Poultry Science, 1993,72 (7) : 1224-1229.
9ZHAO F R,GENG A L,LI B M,et al.Effects of envi- ronmental factors on breast blister incidence, growth performance, and some biochemical indexes in broilers [ J] .The Journal of Applied Poultry Research, 2009, 18(4) :699-706.
10GARCIA R G, MENDES A A, GARCIA E A, et al. Effect of stocking density and sex on feathering, body injury and breast meat quality of broiler chikens[ J] .Re- vista Brasileira de Ciancia Avicola, 2002,4 (1) : 8-13.
