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Stripe pattern and non-stripe pattern female RIR chickens of different ages. (a) 1-day-old; (b) 13-day-old; (c) 28-day-old; (d) 46-day-old. In each picture, the stripe pattern and non-stripe pattern are left and right, respectively. As the chick grows, the downy feathers are gradually replaced with youth feathers and the stripe pattern disappears.
