I kept my meaties and layer chicks together the whole time (a little more than 10 weeks). They were on feed for 24 hours through 3 weeks of age. Then they were given access to the outdoors where I began sprinkling their feed on the ground so that the meaties had to move and scratch to eat and their waterer was kept a distance away from where I'd laid the feed down. I did not give them feed at night, but was out there early to feed them. At 5 weeks they were allowed to free range for a few hours everyday. I never gave mine vitamins and I do not feed them medicated feed. They were very healthy! Never had any problems. I did give them cracked corn the whole week before processing. On a very hot May day (in the nineties, which is unusual for that time of year), I took them to the Amish to be processed. Never lost one (the Amish will not process any that die before butchering). After processing they ranged in size from 5lbs to 7lbs. They are very delicious!!!! My layers stayed in their side of the coop until they were about 14 weeks and then they moved in with the adults.