Lactational trends in vitamin B 12  status on conventional and restricted-roughage rations.
D000821:Animal Feed; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D002417:Cattle / Q000378:metabolism*; D005260:Female; D007774:Lactation; D008099:Liver / Q000032:analysis; D008892:Milk / Q000032:analysis; D011247:Pregnancy; D012417:Rumen / Q000382:microbiology; D014805:Vitamin B 12 / Q000032:analysis / Q000096:biosynthesis* / Q000097:blood / Q000652:urine
D014805:Vitamin B 12