oops
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An original study by Byerly and Quinn (1936) said that the stripe/spot head method for RIR was an average of 82% acccuracy. I at one time only raised RIR and pulled from straight run batches. Only using this method. I ended with all pullets. I think the theory should be that males can NOT have the stripe/spot on their head. Where as pullets may or may not have the marks. So any RIR chick with marking should be pullet, although non marked chicks may also be pullets, just not bearing the simple tell-tale markings.
The pic for me is so blurry I can't see feathers at all. Can you take another r pic? It's been awhile so maybe you already know.