I had a 12 week old BO roo that suddenly appeared sick yesterday. He hardly moved and wouldn't eat. He was normal and active just the day before. I quarantined him last night and he ended up dying in the night. My husband does not want to pay for a necroscopy and says that sometimes chickens just die. I'm concerned about a possible disease and infecting the rest of my flock. I was feeding the roo layer feed, which I found out last night that was probably not healthy, but could it have killed it? Also, when I scatter treats, I throw it on the ground of their run. Now I'm thinking that's not a good idea because of their droppings getting mixed with their treats. Could this make a chicken sick? I have my young pullets on layer feed and have also found out that they are too young for this, could that kill them? Please help!! Also, I didn't provide grit until last night. I thought they would be fine since their run has sand and small bits of gravel. Obviously, I don't know what I am doing! Trying to learn, without killing my flock!