Four multiparous ewes of the 05 synthetic milking line, in the late lactation with T-shaped duodenal cannulas were assigned to a 4 x 4 Latin square design. Animals were fed a total mixed ration with hay and concentrate (50:50,% DM).Treatments consisted of duodenal infusions of 0, 2, 4, and 6 g/d DL-methionine. Average milk yield was low. Duodenal infusion of 2 g methionine non-significantly increased milk production and non-significantly milk protein and fat yield as well as milk protein, fat and casein content. No effect of methionine treatment on the amino acid composition of milk protein was observed.