She is supposed to be one year old, and is very mean to the other hens. I didn't even think she could be a he until someone mentioned the behavior sounds more like a rooster. TIA.
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She is a hen. Glad you have them in quarantine, and in my opinion I wouldn't keep them if they have a sick appearance. Even if you nurse them back to health some diseases they can be carriers of for the rest of their lives and even if they stop showing symptoms they will infect your existing flock and any other new chickens that join later down the road. I would either A) send them right back to the place where you got them or B) Cull them. I would not rehome them to someone new because then their flock will be infected.
x2
I brought in Infectious Bronchitis to my flock with a mature bird...it's not fun to have to nurse your whole flock and watch some of them die because you took in a bird.
She didn't look really obviously sick, just signs of being a little off. And her shipping mate was terrible to her. Birds know when others are sick and they will be really mean to them.
I was in a hurry with my inspection and missed those signs and regretted it terribly afterwards.
I too kept the new birds in isolation, but isolation is secluded at least 100 feet away and downwind AND biosecure...meaning you are careful to not handle them in the same clothes or boots you handle your birds in. Some diseases can even carry on your hair, so you would have to shower too. Some diseases carry in the air (like IB) so you would have to have the sick birds in a bubble tent.
After my experience, I never take in any mature birds any more. If they are sick, cull them or take them back where they came from and be careful to disinfect and not wear the clothes or shoes out to your chickens or you could bring back to your farm what they have on their farm.
Lady of McCamley