that's a good question . some fanciers wait some don,t you get yb,s that are bred early and late both winning. yeboah said your only feeding yb,s longer before racing . a fair point and right enough .hears a question team of ybs hatched late dec rung start of jan then team of yb,s rung late feb mid march .come the 1st yb race witch is the stronger team ?. sometimes worth that bit extra seed only my opinion . the thing to watch for is the moult with natural yb,s will catch the early bred yb,s 1st. for me if you want 2/3 rounds of yb,s from stock birds breed as soon as you can. then again get it a bit wrong like I just did and you are phoning SHU for a few extra 2015 rings