It is normally only late-breds that I breed. Very few earlier ones, if any. It takes a little longer and some more patience, but they seem to be coming on well. I have less losses now than when I was breeding earlier YB's. I bred 09 and 10 yb's as normal, but since then it has been late-breds in the main. 2011 was a bad year for me, 2012, a little better, 2013 and 2014, I think I have it sussed now on how to deal with them. The earlier years, 2011 and 2012, I pushed them too hard and was too impatient. Very often they have more nest flights than new ones. The nest flights hold more water and deteriorate as the season progresses, so you have to be careful with weather and keep an eye on their moult. Dropping three flights in the one week is their way of catching up. Growing feathers takes energy as well, so if you give them care and time, they will reward you.