I got 27 day old chicks last Sunday, we have 5 more coming at the end of the month. My first question concerns health. We have a flock of 7 hens outside now. They will be in a separate coop and run than the chicks will be in, but is there something special I need to be doing to transition them outside in tems of biosecurity? Will they get sick from my older flock because the chicks will be introduced to their germs( for lack of a better word)? I did lose 3 hens last year...one unknown cause, one Polish Created to blood sucking lice (it's been a huge learning curve), and one that had roundworms, recovered (or so we thought) after treatment, was never "right" after that and finally passed away a few months later. My other question is about the 5 baby chicks coming later this month. They should be roughly 17 days younger than the ones we have here, and at the time when I ordered them it didn't seem like a big difference, but this being my first time with chicks (our other flock was already grown when we got them), I now realize how quickly they grow! I want the two baby chick batches to live together, but do I need to worry about putting the day olds with the older chicks, and if I can put them in with the older ones, how do I manage the different heat requirements? We only plan to keep 10-12 of the 32 baby chicks ( we had a hard time coordinating the different breeds we wanted, thus the two delivery dates) too. Not sure if that matters. I may be trying to rehome 14 of them this weekend before we even get the other baby chicks. Thanks for any advice you have. Not sure I'd breed info is necessary for my second question, but we have Salmon Faverolles, Blue and Buff Cochins, W.C. black Polish, and Ameracanas. The 5 coming at the end of the month are 2 Blue Splash Marans, and 3 "assorted" Marans. I tried to go for the docile breeds. mcMurray did throw in what I believe is a Blue Andalusian which is flighty...we have a hamburg outside and were not looking for another flighty chicken.