An 8 × 8 Latin square designed experiment was conducted feeding 8 ileal-cannulated grower pigs weighing 32 kg in a study to evaluate the standardized ileal digestibility (SID) of crude protein and amino acids in five Brassica napus canola meal (CM) samples from five Western Canadian crushing plants. Pigs were fed eight diets (SBM, 5 CM samples, basal, and N-free). For SBM and CM diets, 40% of test feedstuff sample was mixed with 60% barley and wheat-based basal diet. Pigs were fed diets at 2.8 × maintenance (110 kcal of DE per kg of BW0.75) divided into equal 2 meals daily. Digesta was collected on day 8 and 9. The SID of crude protein and amino acids was determined by subtracting basal endogenous amino acid losses. On dry matter basis, the SBM and five CM samples contained 51 and 39–45% CP; 7 and 24–27% NDF; and 4.70 and 4.73–4.82 Mcal/kg GE, respectively.

The SID of the indispensable amino acids (except Histidine) and dispensable amino acids (except Glycine) were greater (P ‹ 0.05) for SBM compared to the five CM samples. The researchers reasoned that the SID of most amino acids was lower in CM compared to SBM was likely due to the greater fiber content in CM. However, the SID of amino acids differed among the five CM samples could not be associated to changes in chemical composition.