I've got blue bantam cochins, 3 pullets and 1 cockerel. So far I've hatched out 6 babies from them - 5 cockerels and a pullet. There have been three splash and three blue chicks. All chicks were hatched under a broody hen, outside in the uninsulated hen house, with wood shavings for bedding in the nest boxes. I know how blue x blue breeding works, with splash, blue and black babies. I'm a little surprised (though somewhat pleased) that I haven't had any blacks yet. Mostly though, I'm disappointed in the ratio of males to females. I've read about incubation temperatures affecting gender of the chicks, and I'm wondering if that has affected the ratio here. Is there somewhere with good, accurate information on this subject? Is it really true that temperature affects chick gender? First hatch was May 31, with a nice, rainy May. It produced 3 males and a female. Temperatures weren't hot, and it was fairly humid (for southern NM). 5 out of 7 eggs hatched, with one chick dying soon after hatching. I'm not counting that chick in the numbers in this thread. Second hatch was July 31, and July was hot some days and rainy some days. One male baby from that hatch. I set two bantam cochin eggs, one had been refrigerated, and the non-refrigerated egg hatched. No development in the other Third hatch was August 20, again with some hot days and some rainy days. One likely male from that hatch, judging by how slowly his wing feathers are coming in. My mamas feathered in much more quickly than the baby daddy, so I'm assuming this slowly feathering baby is a male. I set 10 mixed eggs, only one of which was a bantam cochin egg. All eggs hatched, and I'm unsure at this point of genders.