Table 1.
Ingredient and chemical composition of the experimental diets (%, as-fed basis)
| Phase 1 (wk 1 to 2) | Phase 2 (wk 3 to 4) | |||
|---|---|---|---|---|
| SDPP | Control | SDPP | Control | |
| Ingredient, % | ||||
| Corn | 34.10 | 34.10 | 47.96 | 47.96 |
| Soybean meal, 46.5% CP | 10.00 | 10.00 | 20.50 | 20.50 |
| SDPP | 5.00 | 0.00 | 2.50 | 0.00 |
| Select menhaden fish meal | 6.00 | 6.00 | 8.00 | 8.00 |
| Spray-dried whey | 20.00 | 20.00 | 7.50 | 7.50 |
| DairyLac 801 | 7.00 | 7.00 | 5.75 | 5.75 |
| Extruded soy protein concentrate | 8.00 | 8.00 | 0.00 | 0.00 |
| Corn starch | 5.00 | 8.64 | 2.50 | 4.29 |
| Dicalcium phosphate, 18.5% P | 0.28 | 0.66 | 0.50 | 0.68 |
| Limestone | 0.40 | 0.20 | 0.18 | 0.10 |
| Salt | 0.30 | 0.30 | 0.30 | 0.30 |
| Zinc oxide | 0.30 | 0.30 | 0.30 | 0.30 |
| Vitamin premix2 | 0.25 | 0.25 | 0.25 | 0.25 |
| Trace mineral premix3 | 0.15 | 0.15 | 0.15 | 0.15 |
| l-Lysine·HCl | 0.10 | 0.51 | 0.31 | 0.51 |
| dl-Methionine | 0.13 | 0.28 | 0.16 | 0.23 |
| l-Threonine | 0.00 | 0.23 | 0.13 | 0.25 |
| l-Tryptophan | 0.00 | 0.07 | 0.03 | 0.07 |
| Corn oil | 3.00 | 3.00 | 3.00 | 3.00 |
| l-Isoleucine | 0.00 | 0.09 | 0.00 | 0.06 |
| l-Valine | 0.00 | 0.23 | 0.00 | 0.11 |
| Total | 100.00 | 100.00 | 100.00 | 100.00 |
| Analyzed composition, % | ||||
| Lys | 1.512 | 1.52 | 1.47 | 1.48 |
| Met + Cys | 0.79 | 0.76 | 0.79 | 0.73 |
| Thr | 0.98 | 0.97 | 0.96 | 0.95 |
| Trp | 0.29 | 0.28 | 0.28 | 0.26 |
| CP | 23.12 | 20.38 | 22.80 | 20.91 |
| Calculated composition, % | ||||
| Total lysine | 1.60 | 1.58 | 1.58 | 1.57 |
| Standardized ileal digestible lysine | 1.47 | 1.47 | 1.45 | 1.45 |
| CP | 23.17 | 20.21 | 22.19 | 20.72 |
| ME, kcal/kg | 3,500 | 3,503 | 3,491 | 3,492 |
| Ca | 0.85 | 0.85 | 0.83 | 0.83 |
| P | 0.72 | 0.72 | 0.74 | 0.73 |
| Available P | 0.51 | 0.51 | 0.49 | 0.49 |
| Lactose | 20.00 | 20.00 | 10.00 | 10.00 |
1Dairylac 80 is a sweet and dried whey soluble product (International Ingredient Corporation, St. Louis, MO) containing 3.2% CP, and 0.06% Lys (analyzed composition) and 80% lactose.
2Supplied per kg of diet: vitamin A (as retinyl acetate), 5,500 IU; vitamin D (as cholecalciferol), 550 IU; vitamin E (as α-tocopheryl acetate), 30 IU; vitamin K (as menadione dimethylpyrimidinol bisulfate), 4.4 mg; riboflavin, 11.0 mg; d-pantothenic acid, 22.05 mg; niacin, 33.0 mg; vitamin B12 (as cyanocobalamin), 33.0 mg.
3Supplied per kg of diet: copper (as CuSO4·5H2O), 10 mg; iodine (as Ca(IO3)·H2O), 0.25 mg; iron (FeSO4·2H2O), 125 mg; manganese (MnO), 15 mg; selenium (Na2SeO3), 0.3 mg; and zinc (ZnSO4·H2O), 125 mg.