6Gustafson R H, Bowen R E. Antibiotic use in animal agriculture [J]. J Appl Microbiol, 1997, 83 (5) : 531-541
7Fuller R. Probiotics in man and animals [J]. J Appl Bacteriol, 1989, 66(5):365-378
8Adami A, Cavazzoni V. Occurrence of selected bacterial groups in the faeces of piglets fed with Bacillus coagulans as probiotic [J]. J Basic Microbiol, 1999, 39:3-9
9Alexopoulos C, Georgoulakis I E, Tzivara A, et al. Field evaluation of the efficacy of a probiotic containing Bacillus licheniformis and Bacillus subtilis spores, on the health status and performance of sows and their litters [J]. J Anim Physiol Anim Nutr, 2004, 88:381-392
10Kritas S K, Morrison R B. Evaluation of probiotics as a substitute for antibiotics in a large pig nursery [J]. Vet Rec, 2005, 156:447-448