The Buff Orpingtons are vaccinated for Mareks (they were hatched at Whiting Farms). All other birds are farm hatched and unvaccinated.
 
These birds are living outdoors, are fully feathered and do not need supplemental heat. They are well socialized and can be introducted to adult chickens. 
 
We highly recommend keeping your pullets on a 20% grower formula until they start laying eggs (typically ~22-28 weeks), then switch to a layer formulation. Switching to a layer formula too early can result in poor growth, smaller egg size, and kidney damage (due to higher levels of calcium in the feed).