Ileal and faecal energy digestibility coefficients of full-fat canola seed for swine

Experiments were conducted to determine the ileal and faecal apparent digestible energy (ADE) value of canola seed (CS) for pigs. In the first experiment, five barrows were cannulated at the ileum and given purified diets containing CS with dysprosium chloride as an inert marker. Digestibility of crude protein and lysine were also determined. In Experiment 2, ADE values for CS were determined using the mobile nylon bag technique (MNBT). The true metabolizable energy (TME) of CS was determined using adult cockerels to determine its value as a predictor of ADE for swine. The faecal ADE value for CS was 19.7 MJ kg^-1 DM. The ileal ADE value for CS was 17.6 MJ kg^-1 DM. The MNBT ADE value for CS was 17.1 MJ kg^-1 DM. The TME value for CS was 19.93 MJ kg^-1 DM. The ADE value of CS predicted from the TME value for CS was 16.85 MJ kg^-1 DM, which was 4.2 and 14.5% lower than the ADE values derived by ileal and faecal collection methods. The linear equation determined from regression analysis that was used to predict ADE from TME was:. Y=3.895-0.65X (r=0.91; d.f.=4; SEM=0.38, < 0.01). where X is TME and Y is the ADE value. Faecal digestibility coefficients for dry matter, energy, protein and lysine of CS were 71.7, 82.3, 62.6 and 75.9%, respectively, and those values determined by the ileal method were 59.7, 75.7, 69.5 and 72.1%, respectively.