A national animal rights group will ask millions of its supporters to boycott vacationing in Iowa to protest the state's new "ag gag" law. "People who care about animal rights, who don't want abusers protected, won't be visiting Iowa," said David Matulewicz-Crowley, legal advocacy counsel for Mercy For Animals.Animal welfare groups say the law prevents exposure of abuses, such as slamming piglets into concrete floors and confining animals in small cages.Gov. Kim Reynolds signed a new "ag gag" law Thursday that makes it a crime for journalists and advocacy groups to go undercover at meatpacking plants, livestock facilities and other ag operations to investigate working conditions, animal welfare, food safety and other concerns.Lawmakers said the bill is needed to help protect pig, cattle and other livestock operations from biosecurity threats.