1Engberg R M,Hedemarm M S,Jensen B B. The influence of grinding and peUeting of feed on the microbial composition and activity in the digestive tract of broiler chickens[J]. British Poultry Science,2002,44 : 569-579.
2Craven S E,Cox N A,Stem N J,et al. Prevalence of Clostridium perfringens in commercial broiler hatcheries[J]. Avian Diseases, 2001,45 : 1050-1053
3Asaoka Y,Yanai T,Hirayama H,et al. Fatal necrotic enteritis associated with Clostrid-ium perfringens in wild crows (Corvus macrorhynchos) [J]. Avian Pathology,2003,33:19-24.
4Al-Sheikly F,Truscott R B. The pathology of necrotic enteritis of chickens following infusion of broth cultures of Clostridium perfingens into the duodenum[J].Avian Diseases,1976a,21:230-240.
5Sasaki J,Goryo M,Okada K. Cholangiohepatitis in chickens induced by bile duct liga-tions and inoculation of Clostridium perfringens [J ]. Avian Pathology, 2000,29 : 405-410.
6Belyi I F,Varfolomeeva N A. Construction of a fusion protein carrying antigenic deter-minants of enteric clostridial toxins [J]. FEMS Microbiology Letters,2003,225:325-329.
7Craven S E,Stem N J,Cox N A,et al. Cecal carriage of Clostri-dinm perfringens in broiler chickens given mucosal starter culture [J ]. Avian Diseases, 1999,43 : 484-490.
8Riddell C,Kong X. The influence of diet on necrotic enteritis in broiler chickens[J].Avian Diseases,1992,36:499-503.