For local chickens especially Xuefeng black-bone chickens nutritional research pad blank,a total of 500 Xuefeng black-bone chickens(1 day-old)are used to investigate the methionine requirement. Meeting the other nutrients requirement other than methionine, the diets (meal-corn) supplemented with different level of methionine (0, 0.06%,0.12%,0.18%,0.24%) are assigned to feed the treetment birds. Mensurate performance traits,serum urea nitrogen,serum methionine,serum aspartic acid and serum glutamic acid are tested,which shows the diets supplemen...