Abstract:

In order to meet the needs of the increasing population and the development of feed addition of the breeding industry, so that the spread of the environmental pollution resulting from urban sewage as well as the harmful substance in the feces from the livestock and poultry feeding can be controlled. The present study has firstly tested the biodegrability of 11 photosynthetic bacteria screened and seperated from Yunnan plateau lake in degrading ammonia nitrogen (NH-N), total phosphorus (TP), sulfide and nitrite (NIT). The study showed that being cultured and degraded with 120 h in pollutants with high concentration, the highest degradation rate of NH-N of these 11 bacterial strains was 42.6%; the degradation rate of TP reached 93.2%; the degradation rate of sulfide reached 71.3% and the highest degradation rate of NIT was 100%. Then, the study had chosen 3 bacterial strains with strong intergrated biodegrability, making them mixed into each other and applied in raising piglets. Adding beneficial photosynghetic bacteria to complete feed, the study showed that the breeding efficiency had been largely increased and the content of hazardous material of piglets’ excrements had been effectively decreased so as to eliminate stimulation of these harmful material to animals’ intestinal tract. The study proved that photosynthesis bacteria as feed additive could promote growing development, increase fodder returns and enhance anti-disease capability when it was added in raising pigs.