The National Cooperative Refinery Association (NCRA) and Farmland Industries announced today they would end their year-old Cooperative Refining, LLC, joint venture on December 31, 2000. ``As we reviewed results of a year of joint operation, and considered the significant decisions the respective owners will need to make regarding their own refineries, we concluded that it was in the best interest of our cooperative member-owners that we dissolve the LLC,'' said Leon Westbrock, chairman of the Cooperative Refining board of directors.