6Due L H, Huynh A, Hong, et al. Characterization of bacillus probiotics available for human use[J]. Applied and Environmental Microbiology, 2004,70 (4) : 2161 - 2171.
7Inooka S, Kimura M. The effect of bacillus natto in feed on the sheep red blood cell antibody response in chickens [J]. Avian Dis, 1983,27(4) : 1086-1089.
1K-H. Jeppsson.Volatilization of Ammonia in Deep-litter Systems with Different Bedding Materials for Young Cattle[J].Journal of Agricultural Engineering Research.1999(1)