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Yes, Plymouth Rocks, any color, Australorps, Wyandottes, and Americaunas, would all be heritage breeds, except maybe the production reds. Plymouth Barred, do you mean Barred Rocks?
As for parsing out the roos, I think the word you're looking for would "cull", (to select unwanted/undesirable or unfit items or animals from a group, to remove them. Many of us cull by slaughtering the unwanted birds for food) rather than "parse". Parsing is minutely analyzing something piece by piece, such as a computer program or a sentence structure. (I'm not trying to be critical. Your sentence structure makes me wonder if English may not be your native language, and you might sometimes get the wrong word?)
But yes, that's what many do, raise a flock of dual purpose birds and eat the roos, keep the hens for eggs, until the stop laying (or slow way down). So you'd be in good company, lots of folks do exactly that. It works for me!
Some let old hens stay on a retirement plan, other slaughter the spent layers and use them as stewing hens. They're very tasty, too.
One acre is plenty to raise a fair number of chickens, you should do fine with that. Those are some nice breeds. You might also want to take a look at this:
http://www.ithaca.edu/staff/jhenderson/chooks/chooks.html
It's a nice handy reference to help decide what breeds are best suited to your needs. I refer to it a lot. Good luck to you!