Agri-Farm Products Straw Feeder for Pigs. The durable Agri-Farm Products Straw Feeder for Pigs holds almost 16 gallons of straw, allowing you to feed more pigs with better efficiency in your operations. Simply fill the top opening with straw and let pigs access hay in the lower trough area. The trough area has a vertical metal grill which keeps the hay contained and minimizing spillage. Slower feeding rate benefits your livestock as well!