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.