donkey(s) that kill calves become buzzard bait around here. if you plan on keeping them, maybe they will grow out of it. not worth the risk to me. good luck either way!He's a survivior.... about 3 months old. Enjoying the last of my summer grasses. The other calf was killed by our donkey. So much for protecting the herd......Was good with the cows until the calf was born this summer. They (donkeys) became mean and nasty after the birth, so they are in an extra pasture until he is sold.