Hi all, I hatched these 5 chicks 14 days ago (pics taken at 12 days) and I’m wondering if feather sexing is applicable to hybrids/mixes? The mothers are either black or red sex-links and the fathers are either a black sex-link or a light Sussex - I get eggs from my friend’s flock. This is the second time I’ve hatched from them, but I didn’t really note the feathering rate of the first bunch. This time, I noticed right away that 3/5 have really long wing feathers and are already flying out of the brooder - might these be pullets? And the chicks with shorter wings cockerels? Or does the feather sexing only work for certain lines/breeds? Thanks 

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