According to the broken-line analysis,the riboflavin requirements of male
White Pekin ducks for plasma riboflavin, liver riboflavin, and liver FMN were estimated to be 4.18,3.63 and 3.59 mg riboflavin / kg diet in this study,compared to3.85 and 3.91mg riboflavin /kg for plasma riboflavin and liver riboflavin reported by Tang et al.(2013).