Calf out of first calf heifer, after he was born had to milk the heifer to get colostrum for the calf and noticed that the colostrum was dark brown in color and lumpy, looked like lumpy chocolate milk. Calf did suck then get up and suck a bit, calf was up and moving around a bit. Now today the calf is lethargic and has diarrhea and will not stand up. This is about 3 days after his birth, calf was born on Thursday. Could the colostrum have been contaminated with something and if so, what?