Rooster picking on hen
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It’s possible that young rooster is not a rooster at all but still a cockerel. Cockerels can have trouble winning the respect of an older hen so that mature hen wants nothing to do with him. He’s probably bigger than her so he may be trying to use force to get her to submit to his dominance. Once he matures he may grow out of this behavior.
There is a special case to this. Until a cockerel becomes a rooster and there is no dominant rooster in the flock a hen often assumes the role of flock master. She may be unwilling to give up that role. But when that cockerel reaches a certain point of maturity he wants to take over. It can get pretty vicious when he is taking over. I saw that last year. It lasted two days until he beat her into submission, then they became best buddies. Since there was no blood I let them work it out and they did. There have been other times where the cockerel took over from a dominant hen with no drama at all.
It’s possible he recognizes they are sick. He does not want a sick chicken in his flock infecting the others so he is trying to eliminate them to protect his flock.
It’s possible he is a brute and does not deserve to be flock master or anywhere around other chickens. There are too many good roosters out there to put up with a bad one.
I don’t know what is going on with yours. I’ve had a cockerel 5 months old that was able to take over a flock with mature hens in it. I’ve had a cockerel that could not do that until he was just under a full year old. If he is fairly young you might try isolating him for a month or two and see if he matures out of this phase. Or you can isolate the hen to protect her. Or you can get rid of either of them and see what happens.
If you choose to keep the roo, then the recommended roo / hen ratio is around 1:10 (not caste in stone but a guide) - that could make a difference. From what you have said though, he'd be in the crockpot if i was in your position.
Good luck in whatever you decide
That's it he's crossed the line. He insists on beating her and has drawn blood. I've banned him to the cold side of the coop for a week. Don't know if that will change his attitude but if he persists after this quarantine he'll have a date with a crockpot! Gotta say this is the first time I've wanted to "replace" a roo.
Good decision - one more step towards the dinner table eh?