I have never sent out eggs to hatch. But if I did, I am a very small time person here, I do not have the facilities to have a lot of different feeds, so forth, although of course, chicks get chick feed. I am not sure where I would even find breeder feed.
I am thinking of having some hatching eggs for sale, and really, the hens that produce them will have the same excellent care that all the rest of my chickens do. That is, they will get lots of good feed, and many excellent quality treats, such as meal worms, and good table scraps.
I also give them lots of hay to scratch in, oyster shell as much as they want, and I do get them checked for worms.
To sum up, I would not think if you were taking good care of your chickens that you would have to do something special for the breeders, but I would be interested in others think otherwise.
Most of my chickens also free range, which is healthier than beinging cooped up, although if I were trying to keep them separate to breed purebreds, they would have to be penned.
Catherine