milk cow

a cow that is raised for its milk rather than for beef.
Informal. a source of easily gained income; profitable venture: The new subsidiary turns out to be a real milk cow.

1400–50; late Middle English Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
The only federal required county-level estimates are all cattle inventory, beef
  cow inventory and milk cow inventory.
Patients had use of a hospital library, and a vegetable garden and milk cow
  supplied the kitchen.
He was the first in the neighborhood to introduce both barbed and woven fence
  wire and a refined breed of milk cow.
The cattle inventory estimates provide an important baseline of beef and milk
  cow herd supplies expected.
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