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That is not a breed characteristic. That is a probable lack of protein. Or mites or something.
I agree. I have noticed that Red SLs seem to need higher protien than your average bird going into their third year. They probably have wrung themselves out by that time producing eggs like crazy on just regular layer feed. I feel that if you have a bird producing double volume of eggs from a normal bird, you're going to need higher protien for them to sustain it.
I don't feed my girls on anything less than 18%, and I also give them greek yogurt for an extra protien kick. I can't imagine trying to keep up with losing 6 grams of protien a day, and then sustaining my own muscle mass and body functions. Poor girls.