title: Effect of abrupt ration change on rumen microorganisms and the niacin and vitamin B-6 content of rumen fluid and milk.
mesh_terms: D000821:Animal Feed; D000818:Animals; D002417:Cattle; D004032:Diet; D002523:Edible Grain; D005260:Female; D007422:Intestines / Q000187:drug effects*; D007774:Lactation / Q000187:drug effects*; D000455:Medicago sativa; D008892:Milk / Q000032:analysis*; D009539:Nicotinic Acids / Q000032:analysis* / Q000096:biosynthesis; D011247:Pregnancy; D011736:Pyridoxine / Q000032:analysis* / Q000096:biosynthesis; D012417:Rumen / Q000032:analysis*; D003313:Zea mays
chemical_list: D009539:Nicotinic Acids; D011736:Pyridoxine