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As much as I agree with centarchid that using tribe is outside the norm for use with chickens. It appears to be somewhat proper in the manner used.
I see your logic, but use of tribe is confusing and to my knowledge it is not used in colloquial English of Great Britain with respect to poultry. I am a biologist / zoologist by trade where a version of English is my first language. The accounts givien are hard for me to follow owing to some word choice and assumptions concerning chicken biology and ways of thinking.