not a meat bird subject, but maybe sort of . . . here's my observation: last year I bred a special hen to four different roos and kept ALL the chicks, the earlist spring breedings produced more than 90% pulletts the mid summer breeding were right at 50/50 pulletts & cockerals the late summer/early fall breedings produced more than 90% cockerals Coming on spring now the earlier pulletts are all laying strong already. The later ones are still too small and will be for awhile. However the later hatched cockerals are already breeding. We can't blame it on the roos as in poultry it is the hen that determines the sex of the offspring. I'm thinking is this nature/survival??? More hens than roos sharing the scarce winter food & ready to lay as soon as late hatched males are ready to breed? Anyone else noticed anything like this? maybe I'm just getting a little winter stir crazy. I'm relating this to meat birds wondering if there are more pulletts hatched in early spring when more folks are wanting cockerals . . . if you order straight run early on are you more likely to get female?