How likely is it that "friendliness" (for lack of a better word) can be bred for in a breed that has a known temperment of being shy of humans?
xoxo Annmarie
xoxo Annmarie
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In my opinion, temperament is extremely inheritable. However, I don't think you select for "friendliness" as much as you select for confidence and you remove timid, aggressive, or high strung birds from your breeding pool.
How friendly they are depends upon how they are raised and handled.