Cow protection is the business of the vaisyas and along with our preaching, this is the most important work. We must have a good section of brahmanas in our society and we must also have a good group of vaisyas who can grow grains and tend cows, and thus supply the society with food grains and milk products from the cow like ghee, curd, cream, etc.

(Srila Prabhupada, letter, May 26, 1975)