I don't like hatching eggs because I don't like dispatching cockerels, although with the right breed, we could run them for meat.
I've thought about getting a flock of pure hens and doing a hybrid myself - RIR x LS or similar - but it's just not top of the priority list atm.
Anyway, they all seem chipper now.
Yes, done for Mareks but not avian leucosis but not displaying those symptoms, MF.