Consider the following (notes for stats are at the bottom of the page):
More than one third of the world’s grain harvest is used to feed livestock. 1
Breaking that down a little bit 2
Almost all rice is consumed by people
While corn is a staple food in many Latin American and Sub-Saharan countries, “worldwide, it is used largely as feed.”
Wheat is more evenly divided between food and feed and is a staple food in many regions such as the West, China and India.
The total cattle population for the world is approximately 1.3 billion occupying some 24% of the land of the planet 3
Some 70 to 80% of grain produced in the United States is fed to livestock 4
Half the water consumed in the U.S. is used to grow grain for cattle feed. 5
A gallon of gasoline is required to produce a pound of grain-fed beef. 6
via Beef — Global Issues.