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.
“Some people regard private enterprise as a predatory tiger to be shot. Others look on it as a cow they can milk. Not enough people see it as a healthy horse, pulling a sturdy wagon.”
As quoted in the United States of America Congressional Record: Proceedings and Debates of the 105th Congress Second Session, Government Printing Office, Vol. 144, Part 4, p. 5738 https://books.google.co.uk/books?id=nEI6WcjH8ykC&pg=PA5738
Post-war years (1945–1955)
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Winston S. Churchill 601
Prime Minister of the United Kingdom 1874–1965Related quotes

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.

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/.

“The cow is of the bovine ilk;
One end is moo, the other, milk.”
"The Cow".
Source: Free Wheeling (1931)
Blue Like Jazz (2003, Nelson Books)

Fodor (1990). A Theory of Content and Other Essays. The MIT Press.

As quoted by Tai-yi Lin (Lin Yutang's daughter) in her Foreword (26 March 1950) to The Importance of Living, p. x

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

“A Friedman doctrine‐- The Social Responsibility Of Business Is to Increase Its Profits” (Sept. 1970)

“When people see a strong horse and a weak horse, by nature they will like the strong horse.”
Video interview, quoted in Analyzing Leaders, Presidents and Terrorists by Diane E. Holloway page 325 https://books.google.co.uk/books?id=Jc7CY1yV1g8C&pg=PA325, with NPR transcript https://www.npr.org/news/specials/response/investigation/011213.binladen.transcript.html (9 November 2001)
2000s, 2002