Janice Swanson

INTRODUCTIONThe majority (approximately 95%) of laying-hen houses in the United States use conventional cage (CC) systems. However, concerns have been increasing about CC systems in connection with animal welfare. Some states have passed regulations that require significant increases in hens’ space allocations (e.g., California Proposition 2) or phasing out CC systems (e.g., Michigan) and tr ...