I was wondering what would be the best way to introduce chicks to current flock members. (4 hens) If I were to order baby chicksofrom a hatchery, and raise them in a brooder, how/when should I introduce them? Do I still need to quarintine them in a different part of the yard when they can first go outside? How old should they be before I introduce them? Any advice/information would be greatly appreciated. Thanks!