The study was designed to research the effects of dietary sodium humate(HNa)supplementation on production performance,antioxidant capacity and gas emission of finishing pigs.A total of 300"D×L×Y"foreign crossbred pigs with an initial weight of(65.23±1.34)kg were randomly divided into 5 groups,with 6 replicates per group and 10 pigs per replicate.Blank group was fed with basal diet,experimental groups were supplemented with 0.25%(HNa1 group),0.50%(HNa2 group),0.75%(HNa3 group)and 1.00%(HNa4 group)HNa in basal diet.Experiment lasted for 63 days,pre-experiment lasted for 4 days.The results showed as follows:compared with Blank group,adding 0.75%and 1.00%HNa in the diet of finishing pigs significantly increased final weight(FBW),average daily gain(ADG),and significantly decreased the ratio of feed to gain(F/G)(P＜0.05);Compared with Blank group,the serum total antioxidant capacity,glutathione peroxidase and superoxide dismutase(SOD)indexes of finishing pigs supplemented with 1.00%HNa were significantly increased,and malondialdehyde(MDA)index was very significantly decreased(P＜0.01).Compared with Blank group,adding 0.75%and 1.00%HNa in the diet of finishing pigs could significantly reduce the gas emissions of ammonia,hydrogen sulfide and methane(P＜0.05).In conclusion,adding 0.75%HNa to the diet of finishing pigs can significantly improve production performance and optimize gas emission index,and the antioxidant capacity of pigs is better when adding 1.00%HNa.
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