Answer:

inbreed

Answer	Crossword Clue
INBREED	Cattleman's term.
INBREED	Intermarry
INBREED	Reproduce in kind

INBREED	Become effete, in a way
INBREED	Best-... (dog show category)
INBREED	Way to produce a champion animal, maybe
INBREED	Not go outside the family
INBREED	Keep it in the family?
INBREED	Keep close relations?