When you adopt a rooster (or any chicken really) you need to be very patient and sensitive. Our birds are all in families here on the farm and family connections matter more than food to a chicken.
It can not be over emphasized how social chickens are, they depend on their family members for support and guidance. They have a sort of hive mind in figuring things out. They don't think like humans and they don't solve problems like us.
Chickens are very visually oriented, what you wear around them matters. I wear the same outfit whenever I'm out dealing with the birds and this gives my presence consistency they trust.
WHEN YOU TAKE HOME A NEW FRIEND
When you take a chicken from his family he will be very sad and lonely. No matter how hard you try you can't step in and fill that gap. Time and patience are the two main ingredients to making your new friend feel at home and comfy. Some birds adapt faster than others. Whatever time it takes you need to be prepared to help your new friend realize he is safe and that is not hugging him or putting him in a box.
Let him be who he is, that will build trust.
TREATS ARE THE WAY TO HIS HEART
With all birds having the right treats and snacks on hand can really help you win them as friends. Mary King is very adept at searching for just the right treats. When it comes to treats there is no one size fits all. Here are a few that can help.
BUGS - Cans of grasshoppers and crickets intended for lizards.
MEAL WORMS - We call them noodles, somehow that makes them seem less gross.
POTTED MEAT - A special treat reserved for special occasions. They love it but it's not very good for them.
VIENNA SAUSAGE - One of the most universal bird treats. Slice the sausages into little slices and feed individually if possible. This will build LOVE and TRUST.
LETTUCE - Romaine is a favorite, they even like it kind of brown and rusty. ICEBERG heads are a fun treat and a toy (we enjoy watching the birds tear a head of lettuce to bits). Not all the chickens go crazy about lettuce but those who do like it LOVE it.
CABBAGE - the whole head. We have around 30 birds in flock-1 which is right outside our window. I put out a whole head of cabbage in the morning and it lasts 24 hours. After 24 hours I toss the carcass to the Muscovy ducks and they finish it off. Meanwhile I give the chickens a replacement head. They have a lot of fun pecking at the head. Wild peafowl love cabbage too.