Table 1.
Composition of basal experimental diets (as-fed basis) 1.
| Ingredient (%) | Low Fibre | High Fibre | ||
|---|---|---|---|---|
| LfCP | HfCP | LfCP | HfCP | |
| Corn | 43.96 | 34.31 | 26.63 | 20.52 |
| Wheat | 40.00 | 40.00 | 40.00 | 40.00 |
| Canola oil | 1.00 | 2.00 | 3.40 | 4.50 |
| Soybean meal | 10.00 | - | 10.00 | - |
| Soybean meal (autoclaved) 2 | - | 20.00 | - | 16.00 |
| Wheat bran | - | - | 5.00 | 5.00 |
| Sugar beet pulp | - | - | 10.00 | 10.00 |
| L-Lysine-HCl, 78.8% | 0.87 | 0.59 | 0.85 | 0.69 |
| DL-Methionine | 0.13 | 0.09 | 0.14 | 0.12 |
| L-Threonine, 98.5% | 0.13 | 0.00 | 0.14 | 0.06 |
| L-Tryptophan | 0.06 | 0.01 | 0.05 | 0.02 |
| L-Isoleucine | 0.15 | - | 0.15 | 0.06 |
| L-Leucine | 0.16 | - | 0.25 | 0.10 |
| L-Valine | 0.22 | 0.05 | 0.23 | 0.13 |
| L-Histidine | 0.07 | - | 0.08 | 0.03 |
| L-Phenylalanine | 0.11 | - | 0.13 | 0.02 |
| Limestone | 1.20 | 1.20 | 1.00 | 1.00 |
| Monocalcium phosphate | 1.20 | 1.00 | 1.20 | 1.00 |
| Salt | 0.15 | 0.15 | 0.15 | 0.15 |
| Vitamin-mineral premix 3 | 0.20 | 0.20 | 0.20 | 0.20 |
| Celite | 0.40 | 0.40 | 0.40 | 0.40 |
| Calculated nutrient content 4 | ||||
| DM (%) | 88.3 | 87.4 | 86.0 | 85.0 |
| CP (%) | 15.8 | 18.8 | 16.1 | 17.8 |
| Fermentable CP 5 (%) | 2.04 | 2.79 | 2.38 | 3.33 |
| ME (kcal/kg) | 3286 | 3311 | 3303 | 3343 |
| NE (kcal/kg) | 2520 | 2500 | 2500 | 2513 |
| Ca (%) | 0.70 | 0.70 | 0.71 | 0.69 |
| P (%) | 0.60 | 0.60 | 0.61 | 0.60 |
| SID Ile (%) | 0.61 | 0.62 | 0.60 | 0.61 |
| SID Leu (%) | 1.17 | 1.25 | 1.17 | 1.17 |
| SID Lys (%) | 1.16 | 1.15 | 1.15 | 1.15 |
| SID Met (%) | 0.33 | 0.33 | 0.33 | 0.33 |
| SID Cys (%) | 0.24 | 0.27 | 0.25 | 0.26 |
| SID Phe (%) | 0.69 | 0.77 | 0.69 | 0.69 |
| SID Thr (%) | 0.52 | 0.52 | 0.52 | 0.52 |
| SID Trp (%) | 0.20 | 0.20 | 0.19 | 0.19 |
| SID Val (%) | 0.75 | 0.75 | 0.75 | 0.75 |
HfCP = high fermentable crude protein; LfCP = low fermentable crude protein; ME = metabolizable energy; NE = net energy; SID = standardized ileal digestible. 1 The basal Thr diet within each treatment (LF-HfCP, HF-HfCP, HF-LfCP and HF-HfCP) category is presented. The highest Thr content (not shown) were prepared by including L-Thr at the expense of corn in each basal diet, and the other graded Thr levels were prepared by blending the lowest and highest Thr diets within each treatment category in appropriate proportions. 2 Soybean was autoclaved at 124 °C for 20 min. 3 Supplied per kg of complete diet; vitamin A, 8 000 IU; vitamin D, 1 500 IU; vitamin E, 30 IU; menadione, 2.5 mg; vitamin B12, 0.025 mg; thiamine, 1.00 mg; biotin, 0.10 mg; niacin, 20 mg; riboflavin, 4 mg; pantothenate; 12 mg; folic acid, 0.50 mg; pyridoxine, 2.0 mg; Fe, 100 mg; Zn, 100 mg; Mg, 40 mg; Cu, 15 mg; Se, 0.30 mg; I, 1 mg. 4 Nutrient content of diets based on nutrient content of feed ingredients according to NRC [16]. 5 Calculated as CP—(total CP × SID CP). The SID of autoclaved soybean meal was estimated according to Gonzalez-Vega et al. [17].