Effects of Fermented Diets Including Liquid By-products on Nutrient Digestibility and Nitrogen Balance in Growing Pigs

This study was conducted to evaluate the effects of fermented diets including liquid by-products on nutrient digestibility and nitrogen balance in growing pigs. Treatments were 1) CON (basal diet), 2) F (fermented diet with basal diet), 3) KF (fermented diet with basal diet including 30% kale pomace), 4) AF (fermented diet with basal diet including 30% angelica keiskei pomace), 5) CF (fermented diet with basal diet including 30% carrot pomace) and 6) OF (fermented diet with basal diet including 30% grape pomace). A total of 24 pigs (41.74kg average initial body weight, Landrace × Yorkshire × Duroc), were assigned to 6 treatments, 4 replicates and 1 pig per metabolic cage in a randomized complete block (RCB) design. Pigs were housed in 0.5×1.3m metabolic cage in a 17d digestibility trial. During the entire experimental period, Digestibility of dry matter (p less than 0.05) of treatment CON, F and CF were higher than other treatments. In crude protein digestibility, treatment F was higher than treatment AF and GF (p less than 0.05). Treatment GF showed the lowest digestibility of crude fiber among all treatments (p less than 0.05). In ether extract digestibility, treatment AF and CF showed higher than other treatments (p less than 0.05) except KF treatment. CF treatment showed the best digestibility of ash among all treatments (p less than 0.05). Whereas, For Ca and P digestibility, CF and OF treatments were improved than other treatments (p less than 0.05). Energy digestibility (p less than 0.05) of CON, F and CF treatments were higher than KF, AF and GF treatments. In total essential amino acid digestibility, F treatment was improved than AF, CF and GF treatments (p less than 0.05). In total non-essential amino acid digestibility, F treatment was higher than CON, AF and GF treatments (p less than 0.05). In total amino acid digestibility, F treatment was higher than AF and CF treatments (p less than 0.05) and GF treatment showed the lowest digestibility (p less than 0.05). In fecal nitrogen excretion ratio, GF treatment was greatest among all treatments (p less than 0.05) and F treatment was decreased than other treatments (p less than 0.05). In urinary nitrogen excretion ratio, CON and GF treatments showed the lowest among all treatments (p less than 0.05). In nitrogen retention ratio, CON treatment showed the high and KF treatment showed the lost among all treatments (p less than 0.05). Therefore, this experiment suggested that fermented diet could improve nutrient and amino acid digestibilities of growing pigs.