Hello all. I'm raising chickens for the first time and had a couple of deaths this week. If anyone has some insight to share, I'd really appreciate it. My chickens are approximately 3 months old right now. I found one of my Ameracauna pullets standing lethargic in the coop a few evenings ago. Eyes closed, short gasping breaths. Kind of raspy breathing. I didn't know what to do, so I treated for sour crop (induced vomiting, gave her apple cider vinegar), but the next morning I found her dead. I figured it was an isolated incident, but one or two evenings later, I found my Cochin pullet dead in the coop. No sign of external damage. She had been acting fine that very morning, following me around in hopes a treat. I have an extremely mixed flock and got chicks from quite a few different sources. I did have some losses from Coccidiosis, but I've been treating with Corid in their water-- treat for 4 days, give them a couple weeks break, treat for 4 more days, to try to get them to develop immunity. I haven't vaccinated for anything. Hoping to gain information to prevent any more deaths. Thanks in advance.