Las Vegas, NV (KTNV) -- Animal rights activists with the organization Mercy For Animals held a demonstration today outside a local WalMart on East Tropicana Avenue. Protesters say they are trying to call attention to what they call mistreatment by WalMart's pork suppliers. They say that suppliers often confine pigs in gestation crates. They say that the abuse was discovered during an undercover investigation. Mercy For Animals wants WalMart to require its pork suppliers to phase out the practice of confining pigs. They say that is something that Kroger, Safeway, Costco and McDonald's has recently done. WalMart sent the following statement about the protest: "This is a complicated issue and there are different points of view. "We currently offer gestation crate-free pork products in a number of stores across the U.S. and will continue our on-going discussions with suppliers, non-governmental organizations and food safety experts to increase that number. "We hold our suppliers to the highest standards and do not tolerate animal mistreatment. "We encourage customers interested in learning more about how grocers and restaurants source pork products to contact the National Pork Board (www.pork.org)."