I feel I get lucky with breeding, and I’m sure there is a more exact science, but as I’ve said before, a lot of times they are like farm animals. Give them the conditions and nature takes its course. I don’t ‘cool’, them but living in Oregon it gets colder in the fall and winter, so I start breeding in November, mainly so I will not have eggs hatch during hunting season in September. Haha. The room is an insulated heated room in the shop, so its much colder out there and the temps fluctuate from 90 in the summer in the room without heat, to 81 in the winter with heat, (I can go higher, but use heat strips to get the gradient. So I think that is enough of a ‘natural’ swing for them to breed. I bet depending on location and environment it can be easier or more difficult, but it works out fairly straight forward for my small collection. I bet if I tried to make my chickens breed it would not work out nearly as well as if I just put them together and let them live like chickens. Yeah, this takes some of the science out of it, but its just a hobby not a living, so if they don’t produce I’m not out anything at the end of the year.