PSVI-9 Nutrient and energy digestibility of steam-exploded canola meal in cannulated grower pigs

Abstract

Abstract Nutrient digestibility is lower in canola meal (CM) than soybean meal due to its fiber matrix. High steam pressure processing may increase nutrient digestibility of CM in pigs. To explore, Brassica napus CM was processed at 700 or 1,100 kPa followed by sudden release of pressure to ambient and yielded steam-exploded CM7 and CM11, respectively. The CM, CM7, and CM11 were included at 40% in 3 test diets. An N-free diet was fed to pigs to measure basal endogenous losses of crude protein (CP) and amino acids (AA) and served as basal to measure energy digestibility of CM. Seven ileal cannulated grower pigs (initial BW, 29 kg) were fed the 4 diets over three 9-d periods in 2 Youden squares. Pigs were fed diets at 3.0 × maintenance (110 kcal of DE per kg of BW0.75). Compared to CM, CM7, and CM11 had reduced chemical availability of lysine (87.6 vs. 83.1 and 85.7%), but lower glucosinolate content (1.14 vs. 0.99 and 0.92 µmol/g). Apparent ileal and total tract digestibility of energy was lower (P < 0.05) for CM7 than CM and intermediate for CM11, resulting in lower (P < 0.05) predicted net energy for CM7 and CM11 than CM (1.88 and 1.91 vs. 1.94 Mcal/kg, respectively). Standardized ileal digestibility (SID) of lysine was lower (P < 0.05) for CM7 and CM11 than CM (67.1 and 70.3% vs. 74.3, respectively). The SID of threonine was lower (P < 0.05) for CM7 than CM and intermediate for CM11. In summary, steam-explosion of CM damaged lysine reducing its digestibility and did not increase energy digestibility. In conclusion, steam-explosion of CM did not increase nutrient digestibility of CM for pigs.