You should have some birds which develop faster than others, so choosing faster maturity can be part of your breeding plan. It is important to do weights and hands-on exams to help you discover which of the birds to look at for breeding purposes - their feathers can be deceiving so you have to feel and weigh them to get the right info. In a few years of selective breeding, we've gotten more of our Java cockerels uniform, so that their dressed carcass weight at 6 months is the same as the dressed carcass weight of 10-12 month old cockerels the first few years. It just takes time when you're breeding for multiple traits, to see the results, because you're having to balance so many things. But type and size should always be the highest priority, followed by the other things.I have just started a flock of black Javas. They are lovely, large birds, very slow growers. I'm wondering if growth rate for the table could be improved by adding a dark Cornish to the bloodline.