I have 2 2yr old BR hens. She was so sweet but introduced 2 BR chicks slowly for about 2 weeks.now.and she rears up.and pecks them also same to red sex link chicks. Need suggestions please.
How old are these chicks? Yes, it's normal BUT you should never put a really young chick in with grown hens unless they have a broody hen protecting them. I have an 11 week old pullet I am having to integrate into a flock (BRs, coincidentally) and one is especially vicious, but then, she is the bottom of the pecking order and it's normal for a hen that low to be brutal to a newbie. She doesn't want to be at the bottom anymore and she's making sure the newbie knows her place. I never put chicks in with adults until they have some real size on them or they can be hurt.
Give them a place they can get away from the hens. I put a special single roost up for my youngster so she can get away from the harassment.
I used a large wire dog kennel you put the younger chick in there and they kind of get used to each other. Keep her closed in for a while. Then open it but make it to where she can get in but the bigger hen cannot. That way she has a place to get away if it gets bad.