Pilot studies in cattle and mice to determine the presence of 4-methylimidazole in milk after oral ingestion.
4-methylimidazole (4-MI) was given orally to a cow in increased dosages to determine if it could be detected in her milk and be present at a concentration high enough to affect her nursing calf. 4-MI was found in the milk, but the calf remained clinically normal throughout the experiment. The cow died after the fourth dose of 20 g 4-MI. Four groups of 10 mice each were given oral doses of water, normal milk, cow's milk after low doses of 4-MI, or cow's milk after high doses of 4-MI. All mice remained healthy after a 2-week feeding trial. Six 3-day-old calves were given 4-MI directly in their bottles of milk up to 2 times the highest level found in toxic feed with only mild depression noted in one calf. Two pregnant cows were given 4-MI pre-partum to determine if it would get into the colostrum at higher levels. Both cows received 4-MI 3 days before they calved and for 2 weeks afterward. Cow A exhibited trembling, excessive salivation and incoordination after the initial dose. Cow B and the newborn calves were never affected throughout the experiment. Each time the dose of 4-MI reached 1.5 g or more, Cow A would exhibit the previously described signs. 4-MI was detected in the colostrum but not in higher concentrations than in the other milk samples.
D000821:Animal Feed / Q000032:analysis; D000818:Animals; D002417:Cattle; D002418:Cattle Diseases / Q000139:chemically induced*; D003126:Colostrum / Q000032:analysis; D005260:Female; D005517:Foodborne Diseases / Q000662:veterinary*; D007093:Imidazoles / Q000032:analysis / Q000378:metabolism / Q000633:toxicity*; D051379:Mice; D008892:Milk / Q000032:analysis / Q000633:toxicity*; D011247:Pregnancy; D011248:Pregnancy Complications / Q000662:veterinary*; D012640:Seizures / Q000139:chemically induced; D012798:Sialorrhea / Q000139:chemically induced; D014202:Tremor / Q000139:chemically induced
D007093:Imidazoles; C023439:4-methylimidazole