Kansas Prairie, that could be me talking on the broodies.
I've always got broodies. Some only break from broodiness to molt. Go figure!
I hatched several batches of chicks this Fall with some trepidation because I've heard from Danz and also read elsewhere, that they tend to hatch more cockerels in the Fall. I really don't need more boys and wanted to hatch some girls to raise over the winter so by Spring they'd be ready to join the laying flock. My first hatch, 9 out of 10 eggs hatched, so I hoped that the 50/50 rule would give me 5 girls, 4 boys, but figured the opposite would be true. There were several who seemed to pink up early and I thought I had a bunch of little cockerels on my hands. But one by one, as they've grown bigger, the "boys" started looking more girly. They are now 10 weeks old and I can't hardly believe my luck. I have 1 cockerel and 8 pullets!!!
No actually it is summer when you hatch mostly cockerels. It's the heat that makes them produce more cockerels. If they were laid in extreme heat that might do it. I have a good ratio of 50/50 in the fall and spring.
My second hatch was 100% but after DH made a comment that I was going to run out of roost space once all the chicks were full-grown, I realized he was right and I was gathering quite the motley collection so I sold a few chicks straight run on Craiglist, from that second hatch, keeping back just two chicks. I wanted to keep one that should be an Olive Egger (because the only OE from the first hatch is the cockerel) and one that is out of a Speckled Sussex, just because she is so pretty. Now that they are getting older, it is clear the two I kept are both pullets too.
But it sounds like your chicks might have been conceived during hot weather so you must be doing something right.So....remember the discussion several weeks ago about whether it is the rooster or the hen that determines gender? If it is the rooster, I have another reason to want to keep Cyrus - he seems to throw a lot more girls than boys.