Holding firm at 48 Ranger chicks, four weeks old. I had a few pasty bums within the first week. Nothing major, no one died of it. Here's my question---as of this week, I've noticed at least ten of the Rangers have issues with poop sticking to the feathers coming out beneath their vent. I've checked each one, and each time the vent is clear. It's that the poop is stuck in a hard lump about the size of a marble to the emerging feathers. I've been able to work most of it off. Some I had to cut off with a small pair of scissors. What's going on? Is this normal for broilers? Thanks in advance for any advice/opinions.