 In 2008, Californians voted on Proposition 2, which requires California farmers to provide egg-laying hens, veal calves, and pregnant pigs with housing that gives them enough room to move around beginning January 1, 2015.The law would mostly impact the state's 18 million egg-laying hens.Current industry standards call for caged hens to get at least 67 square inches of space each, a little less than a regular-size sheet of paper (a sheet of paper is 93.5 square inches), and hens are typically caged in groups of two to eight.