Two Soybean Meal Energy Levels experiments were conducted to determine digestible (DE) and metabolize (ME) and the standardized ileal digestibility (SID) of crude protein and amino acids in two sources of high-protein canola meal, conventional canola meal and soybean meal fed to growing pigs. In the first experiment, 40 barrows weighing about 50kg were housed in metabolism cages and randomly allotted to 1 of 5 diets with 8 replicate pigs per diet. A corn-based diet (97.4% corn) and 4 diets were formulated with canola meal or SBM.

The digestion study results for DE and ME were 3,347 and 3,268 kcal/kg in corn, 2,798-3,346 kcal/kg in canola meal, and 4,000 and 3,796 kcal/kg in SBM, respectively. Values for DE and ME were greater (P < 0.05) in SBM than in all other ingredients.

In the second experiment, 10 barrows weighing about 65kg were equipped with a T-cannula in the distal ileum and randomly allotted to a replicated 5 × 5 Latin square design with 5 diets and 5 periods in each square. A N-free diet and 4 corn starch-based diets that contained canola meal or SBM as the sole source of AA were formulated. Each period lasted 7 d and ileal digesta were collected on d 6 and 7 of each period. The SID of crude protein and all amino acids except proline were greater (P < 0.05) in SBM than in the 3 sources of canola meal.