I'm a novice so excuse me if this is a dumb question. A friend of mine is raising meat birds for us and she had them in a tractor until just recently. They've gotten kind of big because the butcher is apparently out of commission for the moment. They got kind of crowded in the tractor and I notice that several of them have extremely poopy bottoms. As in, there are 6" diameter patches where the feathers are hanging down with matted manure. My gut tells me that this just isn't right. But I notice that most of the birds are very lazy, probably from being hybrids that are so meat-heavy. As in they might be pooping while laying down. (?) What's acceptable, and when would I need to worry? How do butchers process birds that come in like this in order to keep everyone healthy?