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For egg production the "True to standard" breeder birds can't hold a candle to hatchery birds. The thing is hatchery Rhode Island reds aren't truely Rhode Islands anymore but are really "Production reds". As stated above, Heritage Rhode Island Reds have brick shapes, are super dark red (look almost black from a distance), and have several other things that define the breed. By breeding for egg production you lose those traits. True heritage Rhode Island reds are ok layers, but could never lay the amount of eggs a production red could. However the heritage birds will live longer, and will lay for longer than production birds.
I know because that's what happened to me. I started about 20 years ago with Rhode Island Reds like you see in the Heritage Breeds threads here on BYC. After all these years of selecting for larger body size, fast feathering, fast growing and higher egg production I wound up with mutt stock that are only nominaly considered production reds.
It's a matter of what YOU want to raise.