 Because those genes are recessive, they need to be in homozygosity to manifest themselves, but as poultry farmers dislike bad-fledged birds, autosomal genes only subsist in very low frequencies.Contrarily, sex-linked delayed-feathering is very frequent, particularly in meat-type breeds like Brahma, Cornish, Cochin, Rhode Island Red, Wyandotte, Plymouth Rock and Orpington.Sex-linked genetic variation has proven to be very useful for the sex identification of one-day-old chicks in commercial hybrids.