Hen being attacked by not only other hen but also rooster.

Is the rooster mounting her? I had a big old hen who was getting too much attention from the rooster so she would attack a younger hen, pinning her to the ground. The rooster would look at it like a submission position and mount the young hen (with the old hen still attacking). Then when the rooster mounted the young hen the old hen would attack the young one at the same time. This amounted to mounting and beating every five minutes or so. I think the old bitty did this so the rooster would bother someone else! Seriously. Unfortunately, that also promoted gang activity and the others started joining in. They ended up getting part of an eyelid of my little girl so I had to intervene. I'd have to come to her rescue every morning. I'd give her extra special treatment, feed her goodies in front of the others and separate her when I had to. Be careful because they can totally mutilate and blind her. I put that tarry no pick on her comb. Another thing I did is upgrade the run and try and make it a better situation. Things to do, more shade, multiple water and food situations. Make sure there is water where this hen can get to it. If she has to hide in the coop a lot, put water in there. Unfortunately, they get so traumatized they're afraid to do anything so the sooner you handle it the better.

 

That's a big pen! Are you sure you didn't mean 4 x 16?!

Okay, okay, maybe some of the breeders on here (not the urban folks with only a few chickens, like me) have pens that big, but gee! That'd be a lot of space for 4 hens, a rooster, and some 11-week olds.

Also;

As for your issue...
Are you absolutely sure that there are no health problems with your RIR hen? Sometimes the other chickens can sense that there's something wrong with a member of the flock, and they'll act upon it violently. Kind of like a hen pushing an egg out of the nest because something's just not quite right about it.
I'd check her over thoroughly, just in case, and see if something's amiss (other than her newly-acquired injuries.)

Otherwise, sometimes the pecking order simply changes for no reason detectable to us human-folk. Perhaps your other chickens felt that your RIR should no longer be leader of the flock, and she decided that she still wanted to be boss... and then a fight ensued. Who knows what goes on in their little chicken brains?

I would suggest that you quarantine her until you assure yourself that she's healthy and healed, and then perhaps put her into the section you have partitioned off for your younger chicks, and see if she does better with them.

 

That's funny. The mean old bitty I was talking about was a large ameraucana hen! For some reason the roosters always LOVED her (or should I say LOVED ON HER). Anyway, I think she was doing it to divert the focus to some other hen. Clever girl.

 

Once blood was drawn, it likely caused more blood to be drawn - it could have been dried blood from an earlier attack but I have noticed with my chickens that if there is any blood anywhere or even just a spot that they think doesn't look right, they all go after it and cause more injury. Keep the RIR hen separate and inspect her thoroughly, let her heal and then try again. If the Ameracauna hen starts attacking again, separate her from the flock for an attitude adjustment before the others join in.

 

Another thing that might be happening is that the coop renovations are disturbing the chickens enough that it has caused a change in the pecking order or just general acting out - chickens do not like change! Even if it is for the best and they get improved and expanded digs.

 

This is the exact same thing that happened to my small flock. I have five RIR's, one rooster and four hens. For some reason, a few months ago the rooster and the other hens have decided to pick and beat up on one of the others. I have did everything I can think of even chasing the hens and rooster down but nothing has worked. They will probably end up killing her one day.

Wayne

 

I just found one of my Leghorn hens with a black (scabbed) & bloody comb. I think the original wound cam from my novice roo pulling on it while the were getting busy. I heard a big ruckus and saw another hen picking at this bloody comb. I have separated here and she'll have a week to heal since I am going on vacation and I won't ask the the pet sitter to mess with her. 2 questions:

1. What is tarry no-pick?

2. will I have any issues reintroducing her to the flock?