High Quality Content by WIKIPEDIA articles! Agriprocessors was the corporate identity of a slaughterhouse and meat-packaging factory based in Postville, Iowa, best known as a facility for the glatt kosher processing of cattle, as well as chicken, turkey, duck, and lamb. Agriprocessors` meat and poultry products were marketed under the brand Iowa Best Beef. Two-thirds of its output was non-kosher. Its kosher products were marketed under various labels, including Aaron’s Best, Shor Habor, Supreme Kosher and Rubashkins.