The cash cow: A vet's perspective.

I've got a feeling that the person who came up with the phrase "cash cow" never ran cows. The difference in the high and low prices for cull cows is measured in a couple or a few hundred dollars, while for replacements the difference is measured in several hundred dollars. To create a herd of cash cows, once a cow has a problem, fix it and then sell her. [Extracted from the article]