I stumbled across this the other night looking for a possible link between Nuflor and Milkmaid's 3-legged heifer calf. It's called fog fever. Do a search and there are quite a few articles that come up for it. This is just one of them.
http://www.cattlenetwork.com/CC_Content ... ntid=11754
http://www.cattlenetwork.com/CC_Content ... ntid=11754