PSXVI-9 - Evaluation of Dehydrated Restaurant Food Waste and Treated Rice Straw on Growing and Finishing Pigs

Abstract: This project was undertaken to evaluate dehydrated restaurant food waste (DFW) mixed with treated rice straw (TRS) on growth, diet digestibility, and meat quality for growing and finishing pigs. The DFW was minced, dried, and mixed without or with TRS at 10% [DFW+TRS1] or 15% [DFW+TRS2], compared with a corn/ soybean meal (CSM) as a control diet. The DFW, DFW+TRS1 and DFW+TRS2 products contained 11.4, 9.8 and 8.4% moisture, 18.0, 16.7 and 15.8% CP, 14.8, 11.7 and 9.3% crude fat, 4.8, 6.7 and 7.3% crude fiber, 5.2, 5.9 and 6.7% ash, 0.67, 0.58 and 0.50% lysine, 0.54, 0.93 and 1.23% Ca, 0.34, 0.68 and 0.78% P, respectively. The experiment used 72 pigs and four diets. In the growing phase, pigs fed a DFW+TRS1 diet gained faster (P < .05) than pigs fed CSM or DFW alone (0.65 kg/d, vs 0.59 and 0.46 kg/d, respectively). In the finishing phase, DFW+TRS2 resulted in ADG that did not differ from those of pigs fed the CSM diet (0.90 vs 0.99 kg/d; P > .05). The average gain: feed was similar for the pigs fed diets DFW+TRS1 or DFW+TRS2 (P > .05). However, CP digestibility was not different (P < .05) in the DFW+TRS2 compared with pigs fed the CSM diet (88.2 vs 85.3%). Carcass fat became softer (P < .05) with pigs fed diets containing DFW+TRS1 or 2. The meat quality from DFW+TRS1 or 2 pigs is acceptable and the overall flavor is comparable with CSM pigs (P > .05). These results indicate that DFW has the potential to produce a nutritious feedstuffs for pigs while offering a viable solid waste disposal option.