The law, which dates to 1873 when cattle were shipped by rail, requires livestock to be unloaded every 28 hours during shipment and given feed, water and rest, the newspaper reported.

More livestock, primarily young pigs, are shipped into Iowa each year than any other state, according to the department records.

The livestock industry has raised concerns about the rule, but also says the decision is unlikely to have much impact on Iowa producers because livestock are usually trucked to the state in less than 24 hours.

Source: agriculture.com