Two experiments were conducted to determine the DE and ME and apparent total tract digestibility of ether extract of 3 distillers’ corn oil (DCO; 4.9, 12.8, or 13.9% free fatty acids [FFA]) samplescompared with a sample of refined corn oil (CO; 0.04% FFA) and an industrially hydrolyzed high-FFA DCO (93.8% FFA) in young pigs and growing broilers. In Exp. 1, 54 barrows (initial age = 28 d) were fed a common diet for 7 d and then fed their allotted dietary treatment (either 100% basal diet or 1 of 5 test diets consisting of 90% basal diet plus 10% test lipid) for the next 7 d in group pens (9 pigs/pen). For the next 10 d, pigs were moved to individual metabolism crates for continued diet and crate adaptation and to a twice-daily feeding regimen. Pigs remained on their respective diets for a 4-d total fecal and urine collection period. For Exp. 2, 567 male broilers were obtained from a commercial hatchery (1 d of age) and reared in grower battery cages that contained 9 chicks per cage. Broilers were fed a common corn–soybean meal starter diet from placement until the beginning of the trial (19 d of age). Birds were then randomly assigned to 1 of 6 dietary treatments (94% basal diet plus 6% dextrose or 94% basal diet plus 6% test lipid substituted for dextrose) on d 19 and were allowed an 8-d dietary acclimation period followed by a 48-h energy balance assay. In Exp. 1, the DCO sample with 12.8% FFA contained the lowest (P < 0.05) DE (8,036 kcal/kg) content compared with the 0.04% refined CO sample and the 4.9 or 93.8% FFA DCO samples (8,814, 8,828, and 8,921 kcal/kg, respectively), with the DCO source containing 13.9% FFA having intermediate DE (8,465 kcal/kg) content. The ME content of these lipid sources also differed among treatments (P < 0.01), following trends similar to their DE values, with no differences noted for ME as a percentage of DE (P > 0.35) content among the lipids evaluated. In Exp. 2, lipids containing 0.04, 4.9, 12.8, and 13.9% FFA had similar nitrogen corrected apparent ME (AMEn) values (8,072, 7,936, 8,036, and 7,694 respectively), except for the industrially hydrolyzed DCO sample containing 93.8% FFA, which contained 6,276 kcal/kg (P < 0.01). Using published prediction equations, the predicted DE of these lipids for swine was 3.5% greater than the values determined in Exp. 1 for all lipid sources, except for the DCO sample containing 93.8% FFA, which the predicted DE was underestimated. Likewise, the predicted AMEn of these lipids for broilers was 7.4% greater than the determined AMEn (Exp. 2) for all lipid sources.
- Distillers’ corn oil