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