Abstract: 7 treatments were set in this experiment, and each containing 3 repeats, each repeat was composed of 10 broilers. Treatment Ⅰ was control group, without folic acid and nicotinic acid. Treatment Ⅱ,Ⅲ,Ⅳsupplemented folic acid 0.75, 1.5, 3.0 mg/kg respectively, and treatment Ⅴ,Ⅶ,Ⅵ were supplemented nicotinic acid 60 and 0.75, 1.5, 3.0 mg/kg respectively.At the 21-old-day, calculating the feed conversion rate by feed intake and average daily gain. The results showed that it could improve the day feed intake and the average daily gain, and reduce the ratio of diet to meat of broilers in diets supplied the different levels of folic acid significantly (P<0.05). It could very significantly improved the average daily gains of broilers by supplied the different levels of folic acid and 60 mg/kg nicotinic acid (P<0.01).

Key words: folic acid; nicotinic acid; broilers; production