My 2 wk old Silver Grey Dorking chick has been a continuous chirper, so I thought it might be breed specific. The only other chicks I hatched were White Leghorn/Delawares.
A few days ago, I noticed she had pasty butt, but it didn't seem to be clogging anything, just extremely poopy and dirty. I cleaned her up. Yesterday, I noticed pasty butt again, and noticed that her nose was clogged. I got the clog out, cleaned her butt up, and she was still breathing through her mouth. I put a drop of water on one side of her beak. It went through her nostril and she drank it, so I knew it was clear (did that to both sides). Then she started breathing through her nose. I put her back in her brooder with the smallest of the leghorn/delawares (the rest of them are in the grow out pen). Then last night, her butt was grubby again. I cleaned it again. Then this morning, her butt was pasty and her nose was clogged again. I cleaned and unclogged.
Other than these two symptoms, she seems completely normal. Energetic, happy, eating, drinking.