title: Milk progesterone assay: a comparison of inter-quarter and sampling time variation.
mesh_terms: D000818:Animals; D002417:Cattle / Q000502:physiology*; D005260:Female; D008892:Milk / Q000032:analysis*; D011374:Progesterone / Q000032:analysis*; D013048:Specimen Handling / Q000662:veterinary*
chemical_list: D011374:Progesterone