title: Letter: "Green gizzard" problem in broiler poultry.
mesh_terms: D000821:Animal Feed; D000818:Animals; D002645:Chickens; D004396:Coloring Agents / Q000009:adverse effects*; D005503:Food Additives / Q000009:adverse effects; D005895:Gizzard, Avian; D008460:Meat; D013194:Staining and Labeling
chemical_list: D004396:Coloring Agents; D005503:Food Additives