Sheesh, I didn't know that either! I've only ever processed in winter, so I haven't had a chance to see the difference. I guess I assumed the lowered fertility rate was due to less activity, cold, daylight etc. Not that their marbles shrankAbsolutely ! Photo period impacts roosters just as it does hens resulting in lowered T levels. Ever process a rooster in the winter ? The size of their testicles is generally much smaller than normal.
You guys are full of good information


I'm figuring lower T levels leads to lower activity as well as lower fertility. That is a lot of hens for 3 roosters to cover.
I can keep more to get fertility up, but I never cared before. Maybe, to keep an addiction at bay, I'd better not start caring!