4Himanen J P.Biological activities of Lipoteichoic Acid and peptidoglyean-teichoic Acid of Bacillus subtilis 168(Marburg)[J].J Gen Microbiol,1993,139:2659.
5Collington G K D S.Parker and D.G.Armstrong.The infIuence of Inclusion of Either and Antibiotics or probiotics in the Diet on the Development of Digestive Enzyme Activity in the pig[J].Brit J Nutri,1990,64:59-70.
