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I don't have problems with the rosters when they are in the broiler pen it is when they have a harem to protect that the fight comes out.
You can surely make progress this way though I'd keep more like 10% as you never know what could happen to them. The only trouble you'll have is that if you are using only one line then what you want must be in the gene pool to begin with or you have shot yourself in the foot before you even begin. Now, if using two or three lines then you stand a much greater chance of seeing the improvement you desire. Of course, if your present Javas are already where you want them and you are just twicking them then everything will be ok.I am not grading. I am only using pure Javas and improving on their type from there.
I am planning to hatch 100-200 eggs and keep one or two.
I plan to cull for deformities and for chicks not having yellow feet. Since they are so slow to mature, I plan to keep all pullets for a year and select the ones that lay the best for breeding. At one year I will compare the roos against each other and the SOP to select the best one.
That is the plan, at least.
I will be trap nesting them.