Have you or any of your friends had a necropsy that will back up your claims? If not, you have no way of knowing what killed them, right?Not sure why I'm constantly contradicted..?...I only know what I know from experience or what my friends have gone through...Appoligies...
Chickens can have heart attacks, or heart disease, but it is *very* unlikely that one would lose four in one night to heart related problems.