This study was conducted to assess the effect of acidification of pig slurry on nitrogen (N) mineralization and its environmental impacts during pig slurry fermentation. Different inorganic and organic acids were used to acidify pig slurry. Four treatments including non-acidified pig slurry (control), pig slurry acidified with sulfuric acid, lactic acid, and citric acid were allocated with three replications. The total N content in the acidified pig slurry was higher than non-acidified pig slurry after fermentation. Acidification tended to increase total N content in pig slurry. Ammonium N (NH4 +-N) released from pig slurry was obviously increased at 7 days after incubation, representing 61.4%, 36.8%, and 37.4% increase in the acidified pig slurry with sulfuric acid, lactic acid, and citric acid, respectively. Nitrate N (NO3 --N) in the acidified pig slurry with sulfuric acid was the highest throughout the experiment period, but non-significant effect of organic acid. A large portion of ammonia (NH3) emission occurred within 10 days, corresponding to more than 55% of total NH3 emission. Total cumulative NH3 emission during the experimental period was lower 91% (2.9 mg N kg-1), 78% (7.3 mg N kg-1), and 81% (6.2 mg N kg-1) in the acidified pig slurry with sulfuric acid, lactic acid, and citric acid, respectively, than non-acidified pig slurry (32.7 mg N kg-1). These results suggest that acidification of pig slurry (particularly with sulfuric acid) can be faced as a good strategy to reduce NH3 emission without depressing the mineralization process.

In order to investigate the effects of magnetized water treated with HI-Scalper153R on body performance and ammonia concentration in feces of broiler chicks, a feeding trial was conducted with a total of 180 broiler chicks. Each treatment had 18 chicks with 5 replications. Chicks during experimental periods, broiler chicks were fed magnetized water and subterranean water, respectively. The results obtained summarized as follows: Body weight gain slightly increased for broiler chicks fed magnetized water compared with control. But, there is no significantly (p=0.36) different among treatments. Feed intake significantly (p=0.046) decreased for broiler chicks fed magnetized water compared with control. Feed efficiency was significantly (p=0.020) improved for broiler chicks fed magnetized water of each periods when compare to the control. Especially, in starter periods, the feed efficiency of magnetized water treatment increased by 10% more than control (1.80 vs 1.69). In feces, average ammonia concentration (ppm) significantly (p=0.004) decreased in the magnetized water treatment compare to control. Especially, the magnetized water treatment decreased by 2.2 times compared to the control in ammonia concentration of feces (83 vs 37ppm).