title: Seasonal variations in copper levels in Yankassa sheep in Zaria.
mesh_terms: D000818:Animals; D003300:Copper / Q000097:blood / Q000378:metabolism*; D008099:Liver / Q000378:metabolism; D009549:Nigeria; D012621:Seasons; D012756:Sheep / Q000378:metabolism*; D014935:Wool / Q000378:metabolism
chemical_list: D003300:Copper