The decision by Burger King, which uses hundreds of millions of eggs and tens of millions of pounds of pork annually, could represent a game-change in the egg and pork supply business as a huge new market has opened up for humanely raised food animals. Already 9 percent of the company’s eggs and 20 percent of its pork are cage-free.

The Miami-based company steadily has been increasing its use of cage-free eggs and pork as the industry has become better able to meet demand, said Jonathan Fitzpatrick, chief brand and operations officer. He said the decision is part of the company’s social responsibility policy.

“We believe this decision will allow us to leverage our purchasing power to ensure the appropriate and proper treatment of animals by our vendors and suppliers,” he said.

Other chains, including McDonald’s and Wendy’s, have made overtures in this general direction, but haven’t put out a firm timetable like our friends at Burger King have. Big deal for the animal rights crowd.