A rooster never knows who are his chicks and who's are someone else's. That's why a rooster should never attack chick. Age can have something to do with it. Most rooster will start to see chicks older than 8-10 weeks as intruders and may potentially attack them. Younger chicks should be seen as someone's offspring, whether theirs a broody with or I'm integrating ones I've brooded. If they are young enough they should be accepted and looked after. If your rooster is attacking chicks I probably wouldn't keep him or breed from him.
Is your rooster young? Young roosters don't always know what they are doing and are sometimes making bad decisions based on hormones.
Is your rooster young? Young roosters don't always know what they are doing and are sometimes making bad decisions based on hormones.