www.copork.org -Colorado Pork Producers Council is a livestock organization whose goal is to provide a unified voice for pig farmers leading the way in promoting, educating, and providing visibility and transparency of the industry to all of Colorado.

www.nationalswine.com - Landrace, Yorkshire & Hampshire Breeds

http://www.nationalswine.com/pedigree_services/breed_eligibility.php

cpsswine.com Chester, Poland, Spotted and Hereford Breeds

Teampurebred.com - Berkshire Breed Registry

http://nppc.org -The National Pork Producers Council, which consists of 42 affiliated state associations, is the global voice for the U.S. pork industry, enhancing opportunities for the success of pork producers and other industry stakeholders by establishing the pork industry as a consistent and responsible supplier of high-quality pork to domestic and world markets.