The incubation period for these in baby calves is usually around three days. Scouring baby calves infected with these shed them in very high numbers, contaminating everything around them. Heifers' calves are more susceptible than cows' calves. Reducing Exposure - Beef Move cows and heifers to separate calving area several weeks before calving. Skin and hair of cows on winter feed and bed ground will have infectious agents shed by carrier cows.
Heifers have poorer colostrum.
Heifers need more supervision. Reducing Exposure - Beef 1 Day after calving, move pair to large pasture area to spread out. Exposed calf takes about 3 days to begin shedding agent in large numbers. If scours develops in a group, leave all of that group in place but turn out new pairs to a new pasture. DO NOT bring in purchased calves to replace dead calves.