Treatment of Household Food Waste at High Temperature and High Pressure, and Utilization of the Resulting Material as Pig and Chicken Feeds

Abstract

Food wastes from households were treated with steam at 150 °C for 40 minutes (150SFW) or at 200 °C for 150 minutes (200SFW), and the possibilities of developing the resulting materials into livestock feeds were researched. Both SFWs were shown to be composed about 20% of proteins and 20% of lipids, which are higher than the ratios of commercial diets for finishing pigs. On the other hand, pepsin digestibility of both SFWs was 26-56%, which was lower than that of a commercial diet. To estimate the applicability of SFWs as feed, eight pigs, each weighing approximately 70kg, were divided into test and control groups of four pigs each. In the test group, the pigs were fed diets that were 20% 200SFW for an initial 29 days and were subsequently fed diets that were 15% 150SFW until they reached 110±5kg. Pigs were fed diets without SFWs in the control group. The daily gains (DG) of two pigs in the test group were similar to those of pigs in the control group through the test period. The other two pigs in the test group had relatively lower DG when 200SFW was given, but ultimately reached 110±5kg 29-46 days later than pigs in the control group.