Thanks for replying!
I have not seen any discharge. Nor have I heard any rattling or gurgling when he breathes - just that hollow sound, like a person would sound without a voicebox.
I haven't tried to look inside his throat - will have to try that.
Holding him and feeling around, I couldn't feel anything in his crop: couldn't even find it, actually. He hasn't been eating. I put some greens, tomatoes, cheese, and meat in with him a week ago, and he ate a little, but very little. Then left it till it got old and I threw it out. He did show a little interest in cracked corn, but again didn't consume much.
Today though I believe he has eaten some.
He has pooped - again not much, but some.
None of the other (24) chickens have shown any similar signs.
My first indication something was up, in hindsight, was two weeks ago, when he lost his position in the pecking order to another rooster. The new guy was chasing him constantly. Then I noticed he wasn't crowing, then he wasn't moving much, and I removed him to the crate he's in now a week ago.
I'm still new at this. This is my first flock, and these guys are 38 weeks old. I tell myself that I am raising a flock, and not individual chickens. Been reading and re-reading stuff this week, and starting to think the right thing to do is to cull this guy. Don't enjoy doing that, but I don't believe it would be wise to ever breed him now. On the other hand, if he performed his other rooster duties well, he could still serve a purpose, the same as a broody hen which I hope I have at least one of.