We had our older ybs on darkness this year and to be honest found it easy enough and all our ybs or I should say most will be darkies next year it just makes things a lot easier and you know you will get every yb to every race if you wish Ps...we had a later bred natural yb whose 1st race was 127 mls and then went twice 150 mls approx and both yb national races approx 270 mls timed on the shift out of both as she was still holding enough feathers on her head Nearly all darkies on their last flight out once a week for a bath and just over an ounce a day of moulting mix...