Agri-Farm Products Hay Rack for Sows in Groups. The durable Agri-Farm Products Straw Feeder for Pigs holds almost 13 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 through the bottom. The trough area has a vertical metal grill which keeps the hay contained and minimizing spillage. The lower tray keeps hay from spilling on the floor. Slower feeding rate benefits your livestock as well!