When dietary folic acid increased from 0.06 to 2.86 mg/kg, the weight gain rate (WGR) significantly increased from 136.6% to 174.6% (P b 0.05). And then, there were no significant differences in WGR among treatments as dietary folic acid contents increased from 2.86 to 35.71 mg/kg. Broken line analysis indicated that the dietary folic acid requirement for juvenile abalone was estimated to be 2.62 mg/kg
Fig. 1). The regression equation was as follows: Y =168.73 − 13.613 (2.62 − X), R2 = 0.944, where, X is the dietary folic acid levels and Y is the WGR. 3.3. Soft