I'm not sure what age roosters are when they get big enough to 'harvest', but my mom works with people who eat their chickens, so we're going to end up seeing if they want him for dinner since that'll be his fate i'm sure no matter where he goes so I'll be able to have all mine on layer feed =)
But I'd assume you just give them all flock raiser and put oyster shells out so the females can get more calcium as they need it, though.
And I'm happy to hear we only got 1 boy, even though OF COURSE our FAVOURITE had to be a boy. I'll probably go buy a couple more RIRs at some point so we can have eggies from them, plus they're gorgeous(I really want New Hampshires though.... hmmm))