I know this its going to be long so sorry in advance. I kept 15 OEG and blue wyndott in the house for about two weeks and everything was fine. I went to the auction last week and bought 10rir chicks and out in there with them. Two days later 2 chicks died. I assumed the size difference and limited space caused it so I moved all of them out side to my big brooder with some older gold laced chicks. five days after introducing the rir chicks, I have 12 out of over 30 chickens left. I bought some corid today gonna try that but I have no idea whats wrong. I have nice had chickens to sure like this although this us the first time I have bought chickens from someone I didn't know