Blackhead is a disease that turkeys can get if they are exposed to chickens that have worms. If you free range the chickens and turkeys together make sure your chickens have a good worming program. Free range turkeys can still get blackhead however, from being exposed to wild bird poop or even earth worms which can also be carriers.
Putting turkey eggs and chicken eggs in the bator together is common, as stated set them a week appart so they hatch out the same time. Chicks being with poults is the best way to assure that the poults learn to eat and drink and stay the right temp (under the light or just out from under) as they are followers. About week 2 I move the chicks out as I find the poults are getting big, sometimes picking on the chicks and I want to get the chicks onto chick food, but some people leave them with the turkeys.
Putting turkey eggs and chicken eggs in the bator together is common, as stated set them a week appart so they hatch out the same time. Chicks being with poults is the best way to assure that the poults learn to eat and drink and stay the right temp (under the light or just out from under) as they are followers. About week 2 I move the chicks out as I find the poults are getting big, sometimes picking on the chicks and I want to get the chicks onto chick food, but some people leave them with the turkeys.