【Objective】To study the effects of non-nutritional additives on fattening pig production performance,blood biochemical indices and NH_3 and H_2S in fermentation manure.【Method】 100 healthy Landrace hybridization pigs with similar birthdates,half male and half female,weight(59.95 ± 1.25 kg) were selected for the study.They were randomly divided into 5 groups,namely the control group,Exp.1,Exp.2,Exp.3 and Exp.4,with 20 in each group.They were fed with basic diet,basic diet adding 0.1%/t phytic acid enzyme,0.1...