Abstract: In order to study the effect of adding different proportions of corn citric acid residue in feed on the weight gain of fattening pigs, 40 fattening pigs of about 60 kg were selected in the experiment, and were completely randomly divided into 5 treatment groups with 8 pigs in each treatment group by single factor. The control group was fed corn-soybean meal basal diet, and the four experimental groups were fed diets containing 3%, 6%, 9% and 12% corn citric acid residue, respectively. The results showed that: ⑴there was no significant difference in average daily feed intake between the four experiment groups and the control group(P>0.05); ⑵the average daily weight gain and feed meat ratio of group A and B were not significantly different from the control group(P>0.05). The average daily weight gain of group A and B was 0.77% and 1.24% higher than that of the control group respectively(P>0.05). The feed meat ratio of group A and B was 1.63% and 2.29% lower than that of the control group (P>0.05). ⑶the average daily weight gain and feed meat ratio in group C and D were significantly different from those in the control group (P<0.05). The average daily weight gain in group C and D was 2.73% and 4.39% lower than that of the control group, and the feed meat ratio of group C and D was 3.59% and 4.9% higher than that of the control group (P<0.05). ⑷the feed cost of fattening pigs in group A and Group B decreased by 2.52% and 4.4% respectively for each 1 kg gain. The results showed that adding a certain amount of corn citric acid residue to the diet had a certain promoting effect on the growth performance of fattening pigs, and the economic benefit of breeding was significant, among which 6% was more suitable.

Key words: corn citric acid residue, fattening pigs, economic benefit, application