Difference between Cow in milk and Milch cow

cow in milk—a cow yielding milk:

• Their goal now is to decrease the number of cows in milk and maintain production and profit where it is.

milch cow—

1. = cow in milk:

• The farm needs the replacement of milch cows as the original stocks have become less productive.

2. a person who is easily tricked out of his money; a source of easy income:

• The industry is a milch cow for state and national political campaigns.