IMPORTANT...Please read and answer...I have three hens and one rooster, they are almost five months old...at the local animal shelter, there is a rescued hen...do not know her age, she appears to be a Cochin. I want to adopt her into my flock. My hens are New Hampshire reds and my rooster is a Jersey Giant. Can I do this or will there be bad fighting with my flock. If the hen at shelter doesn't get adopted they will put her down so please answer is you know as soon as you can.