That is a new one to me too. Not something that they warn you about, that is for sure (like Tetanus for example). In this part of our province waterbelly can be a problem, depending on where you are. Right around were we are it is not an issue, calves almost never have problems, go about 15 miles south and it is a different story, you'll see it in about 1-2% of the calves that come out of there. Nobody is exactly sure what causes it, but they figure it is one of the grasses or plants that they eat, and the vast majority of those calves are knife cut at branding, when they are 2-3 months old. All of our calves are banded within 24 hours of birth and we've never had a problem...