Good luck with that, i could never find anyone who just wanted boys! And even after I found out which were the boys and separated them because they'd raped the girls and made them bleed all over the place, they just went on fighting among themselves. Each hatch, I got far more boys than girls and ended up culling them all, after which the girls settled down and laid happily every day for about 3 years. Maybe you'll have better luck, I hope so!