Iowa grocers participating in a supplemental food program would have to offer conventional eggs from confinements if they sell eggs from free-range or cage-free chickens under a bill passed by the Iowa House, the Des Moines Register reported. House File 2408 was approved on an 81-17 vote, and moved on to the Senate. Supporters said the law would assure that the cheaper conventional eggs are available. Environmentalists said the bill appears to be a move to support what they call “factory farming,” which they oppose as cruel to the chickens and a source of odors and pollution. Democrats criticized the bill as anti-free market, a jab at the GOP’s goal of reducing regulation on businesses.