A 2×5 factorial experiment,using 2 dietary methionine levels (0.28%and 0.48%and 5 dietary choline levels (0,394,823,1239,and 1743 mg/kg) ,was conducted to study the effects of dietary methionine status on choline requirements of starter white Pekin ducks from 7 to 28 day of age.Four hundred eighty 7-d-old male White Pekin ducks were randomly allotted to ten dietary treatments,each containing 6 replicate pens with 8 birds per pen.At 28 d of age,weight gain,feed intake,and feed/gain were measured and the legs of all ducks from each pen were examined for incidence of perosis.Perosis and growth depression were observed in choline-deficient ducks and supplementation of choline reduced perosis and significantly increased weight gain and feed intake regardless of dietary methionine levels (P<0.05) .In addition,significant positive effects of dietary methionine supplementation on weight gain,feed intake,and feed/gain were observed at any choline level (P<0.05) .Supplementation of choline in diets alleviated the depression of weight gain and feed intake caused by methionine deficiency at 0.28%methionine level.The interaction between choline and methionine did not influenced weight gain,feed intake,and feed/intake of ducks (P>0.05) .According to the broken-line regression,the choline requirements of starter Pekin ducks for weight gain and feed intake were 1567 and 1579 mg/kg at 0.28%methionine level and 1288 and 1239 mg/kg at 0.48%methionine level,respectively.Compared with the adequate methionine level,menthionine deficiency markedly increased the choline requirements of ducks.