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Iowa Senator Chuck Grassley is trying to make the marketplace more competitive with livestock.
He wants to ban packer ownership of animals.
In a statement Grassley says large companies have joined forces to create business giants, making it harder for independent producers to buy and sell their products.
The measure amends the 1921 Packers and Stockyards Act prohibiting arrangements that give packers managerial, supervisory, and operational control of animals.
Grassley introduced similar measures in 2007 and 2012.
There are exemptions: Arrangements that happen within a week, cooperative with a majority of members that own livestock, packers that are not subject to mandatory reporting laws, or a packer that only owns one livestock processing plant.
The National Pork Producers Council says Grassley's bill hinders market access and they support rights of all producers.