Starting 4-5 days ago he started grunting/crying out when he tries to poo. He gets poo out each time although it's only very little (no blood or diarrhea). He has, as long as I can remember only pooed small amounts, not as big as the girls even though he's a full sized rooster. So far I've tried putting olive oil in his vent and feeling around to see if I could find any obstructions but nothing. I've been giving him olive oil by mouth the past two days hoping he's just constipated and it'll loosen things up but doesn't seem to be getting better. I also wormed him bc he did have a roundworm in one of his poos. He's eating, drinking, mating and acting otherwise normal except he's not been crowing very much which is very unusual for him. Any ideas or suggestions would be greatly appreciated!!