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I agree that there are two different lines of RIR's but there are also other production versions of Hatchery type RIR production strains.
Some are a cross between RIR's and New Hampshires as this cross is done to get the hybrid type vigor in these layers just the same as is used in producing a sex-linked egg layer with the exception of the chicks being sexable by color at hatch.
One hatchery that advertises this cross is Ideal, heres what they say their version of a Production red is: Production reds are a brown egglayer that was developed for efficient production of largr brown eggs. Crosses utilizing Rhode Island Reds and New Hampshires were used in the developement of this breed, ect........
You can go on their site and read it.
Now with that being said I know for a fact that some hatchery stock Production reds are a mixture because I've rebred these types of chickens and they don't breed true, Some are dark like the parent stock, some are the more "orangey color" like New Hampshire(most of the time these are male) and some are mutliple shades of red in their plummage (dark red and lighter red all combined).
Theres an earlier posted thread on here on this topic I'll go find it and post it here later.
catdaddy