Centerplate, one of the largest food management companies in the country, announced last week that the Stamford-based company has made a commitment to source all shell eggs within the United States from cage-free hens and all pork within the US from crate-free pigs. The move comes nearly a year after The Humane League began calling on the catering giant to discontinue the use of eggs sourced from farms practicing intense confinement of egg-laying hens known as battery cages.