Speech of July 19, 1985. Quoted in David Robinson Simon, Meatonomics (Conari Press, 2013), p. 193 https://books.google.it/books?id=PY0KUnaIU5AC&pg=PA193.
“Truth, Sir, is a cow which will yield such people no more milk, and so they are gone to milk the bull.”
July 21, 1763, p 514 http://books.google.com/books?id=JOseAAAAMAAJ&q="Truth+Sir+is+a+cow+which+will+yield+such+people+no+more+milk+and+so+they+are+gone+to+milk+the+bull1"&pg=PA514#v=onepage
Life of Samuel Johnson (1791), Vol I
Context: Hume, and other sceptical innovators, are vain men, and will gratify themselves at any expence. Truth will not afford sufficient food to their vanity; so they have betaken themselves to errour. Truth, Sir, is a cow which will yield such people no more milk, and so they are gone to milk the bull. If I could have allowed myself to gratify my vanity at the expence of truth, what fame might I have acquired.
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Samuel Johnson 362
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The Note-Books of Samuel Butler (1912), Part XVII - Material for a Projected Sequel to Alps and Sanctuaries

“The sweet mellifluous milking of the cow.”
The Milking of the Cow, reported in Bartlett's Familiar Quotations, 10th ed. (1919).

Tweet on Twitter (12 Jun 2014) https://twitter.com/thandienewton/status/477086748728905728. Also quoted in “PETA’s Sexiest Vegan Celebrities of 2014: Thandie Newton and David Haye Nab Top Honours!,” in Peta.org.uk (23 December 2014) http://www.peta.org.uk/blog/petas-sexiest-vegan-celebrities-2014-thandie-newton-david-haye-nab-top-honours/.

Quoted in Jeffrey M. Masson, The Face on Your Plate: The Truth About Food https://books.google.it/books?id=-LeUV2wr2BoC&pg=PA0 (Norton & Company, 2009), p. 194.

“You may not sell the cow and sup the milk.”
Quoting an old adage in Nordenfelt v. Maxim Nordenfelt Guns and Ammunition Co. (1894), L. R. App. Cas. (1894), L. R. App. Ca. Part 5, p. 572.

“I sucked the milk out of a thousand cows.”
Song lyrics, Modern Times (2006), Thunder on the Mountain

“The cow is of the bovine ilk;
One end is moo, the other, milk.”
"The Cow".
Source: Free Wheeling (1931)
“Don’t milk the cow too hard. She will kick you.”
City Aphorisms, Eleventh Selection (1993)