47 Effects of Various Heat Treatments on Concentrations of Digestible and Metabolizable Energy and on Amino Acid Digestibility in Soybean Meal Fed to Growing Pigs

• Published in: Journal of animal science 2018-04, Vol.96 (suppl_2), p.25-26
• Main Authors: Mathai, J K, Htoo, J K, Wiltafsky, M, Stein, H H
• Format: Article
• Language: English
• ISSN: 0021-8812; 1525-3163
• DOI: 10.1093/jas/sky073.045

Abstract Two experiments were conducted to determine DE and ME and standardized ileal digestibility (SID) of AA in heat-treated soybean meal (SBM) fed to growing pigs. The 9 treatments were prepared using a conventional SBM that was either not autoclaved or autoclaved following one of 8 treatments: 110°С for 15 or 30 min or 150°С for 3, 6, 9, 12, 15 or 18 min. In Exp. 1, 20 barrows (43.6 ± 2.2 kg) were assigned to a replicated 10 treatment × 4 period Youden square design. A corn-based basal diet and 9 diets containing corn and one of each SBM treatment were formulated. Urine and feces were collected for 5 d. In Exp. 2, 10 ileal-cannulated barrows (36.8 ± 1.2 kg) were allotted to a 10 treatment × 7 period Youden square design. A N-free diet and one diet for each of the 9 SBMs were used. Ileal digesta were collected on d 6 and 7 of each 7-d period. Orthogonal contrasts were used to compare effects among treatment temperatures and to determine linear effects of heating duration. There were no effects of autoclaving at 110°С on ME in SBM or on SID of AA in SBM, but both ME and SID of AA in SBM were less (P < 0.01) if SBM was autoclaved at 150°С compared with 110°С (Table 1). At 150°С, there were linear decreases (P < 0.01) in both ME and SID of AA in SBM as heating time increased. In conclusion, autoclaving at 110°С did not affect ME or SID of AA in SBM, but autoclaving at 150°С had negative effects on ME and SID of AA in SBM as heating time increased. Table 1. Metabolizable energy and SID of AA in SBM Item Heating temperature Control 110°С 150°С Duration (min): 15 30 3 6 9 12 15 18 ME, kcal/kg DM1,2 3,665 3,708 3,696 3,443 3,358 3,201 2,862 2,561 2,562 SID of AA, % Lys1,2 94.8 94.1 93.3 84.2 80.7 80.1 75.9 74.9 62.6 Met1,2 94.3 93.1 93.2 88.1 87.6 87.7 86.3 86.3 80.3 Thr1,2 89.8 89.2 89.9 83.3 82.2 82.8 81.2 81.8 74.8 Trp1,2 89.2 88.3 89.9 83.5 83.2 83.4 81.4 82.2 76.8 1110°С vs. 150°С: P < 0.001. 2Linear effect of heating time at 150°С: P < 0.001.