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What a pretty rooster you have there

!
Not all roosters will be aggressive, it normally has to do with breed, quality, and the individual personality of the chicken.
I have two roosters, a silkie and a polish bantam.
They are wonderful! Best roosters i have ever had! They even get along nicely together and don't fight (they weren't even raised together).
My polish roo is actually one of are favorites out of all are chickens. He sits in are lap and cuddles.
How old is your rooster?
When they are still young they are sometimes difficult to determine aggression wise.
When they hit maturity (approximately 1-2 years old) you will pretty much know what kind of rooster you have.
Some will only go through a week of showing alittle dominance or aggression due to hormones, in my situation if you put them in their place, it was corrected and never happened again.
And some other times it just won't work and they may stay aggressive.
There are some things you can do if a rooster shows aggression to you.
For one, don't let them mate in front of you, this is them showing dis-respect to you.
Alpha roo's will not let beta's mate in front of them, you want to be looked upon as the Alpha.
Also don't let them side step you. Any type of dominant behavior toward a human should not be tolerated, only submissive behavior.
If he trys to go after you, hold him down to the ground till he stops.
Or pick him up and walk around with him in front of the hen (this emasculates them)
You can also peck them on the head, with your finger, if you don't like something they are doing.
If he ever does go after you, never back down because that shows weakness and he will think he won and keep going after you in the future.
My mother use to have to pretty much punt are old rooster to keep him away. Not that i am saying you should punt him, but protect yourself if necessary.
But if it really comes down to it and he becomes dangerous to you or your children.
Do not keep him, some roo's just don't change.
I had a mean Old English game roo that use to attack everyone no matter what.
He was horrible and could and did do alot of damage.
We tried everything and he just never got nicer.
Good luck with your rooster!
They are not all bad, only some.
All chickens have their own personality's so try and get to know yours.
She beat me to it! Exactly what I was going to say! My roos respect me. They don't normally try to mate with me around, but if they do, they get a chasing.
I also don't tolerate any aggression towards the hens or one another. Steve (my silkie roo) tried to peck a girl that jumped up on the roosting poll beside him, and I swiftly pushed him off. He has never tried anything at me, and he is 1+ years old. My BR is still young. No aggression or mating attempts yet. He also gets pushed off the roost if he tries to bully. This seems to be the only time I see bullying.. at night on the roosts. I have 4 - 4' roosts and 13 chickens. They normally all pile on the same roosts (silly chickens!), and my dominant hen won't let any other chicken sleep on the same roost as her, so really, it's 3 4' roosting poles between 13 chickens