Very good question! Is there something about fall?
My usually very kind and courtly rooster has been a terror to the ladies since he recovered from molt. He still croons over treats and good nest spots, but when he goes for a ride he is unusually brutal. His favorite hen got gouged a few weeks ago and is only now healed enough I am no longer worried about her guts falling out. I removed his spurs, but he still leaves scratches on them.
He is still a fine fellow, friendly and tame toward humans, he is just hammering the girls. Gotta make more hen saddles.