My 10 wk old Salmon Faverolle rooster, Mister, just passed away. He was showing symptoms of sour crop, he's been in the house for observation since yesterday and has not eaten for over a day at least. Only 1 small poop since yesterday. Drinking a lot. Yesterday I massaged his crop and did get a bit out. Today he was more lethargic, so tried massaging again, when he started shaking his head hard and I think choked, stretched out and died within seconds.....I did a necropsy and found long grass, whole kernel corn, grity material and soft mashed feed. Should I have instead done the oil first? Should we not give whole kernel corn as we have for 5 years with no problems? What could I do differently? Any advise? I want to at least learn something from this sweet boys death, to try and help another in the future. Also, he was not good about grooming himself like my other chickens, could there have been something else going on as well?