I've had chickens for the past couple years now. A couple of my hens have gross white stuff coming out of their vents. A while back, we had the same thing with one hen and we ended up having to put her down because she had anemia. These hens that have it now are still happy and scratch around. One hen will poof up somewhat and that makes me think she is next to die. Any thoughts? Here are some pics of the hen I think may be sick.