Good one! (Trading Places)

I've heard many variations over the years (but not that one.):

... ran over a farmer's (A: chicken.)
"... and I'd like to replace it."
"Well, OK, (B: how many eggs do you consistently lay?")

A: cow.
B: "... how many quarts of milk do you give?"

A: prize pig.
B: "... but you'll have to sleep in the pen 'til we get you fattened up for market."

A: wife.
B: (Oops, censored by the Decency Police.)