 The preparation of new breeds to produce feather sexable crosses implies considerable previous genetic work which is completely beyond the means of most poultry farmers.There are some multifactorial autosomal genes which affect only chicks with delayed-feathering and have no effect on fast normal-feathering chicks, nor on adult plumage.The sole effect of multifactorial slow-feathering is to reduce the length of the primary remiges of one-day-old chicks without a concomitant reduction of the primary coverlets.