- Study: Potential Impacts of the Proposed Ban on Packer Ownership and Feeding of Livestock News Release: Sparks Study Concludes Johnson Amendment Could Cost Pork Industry More Than $7 Billion Click Here! To listen to the Trade Promotion Authority Radio Ad Trade Promotion Authority (TPA) About NPPC Staff Contacts Checkoff Settlement Separation Producers Pork Alliance information, PNTR, Pork ...nppc.org