Table 1.
Composition of experimental diets1 (as-fed basis)
| Item | Phase 1 | Phase 2 | Phase 3 |
|---|---|---|---|
| Feedstuff, % | |||
| Corn, yellow dent | 40.05 | 38.43 | 40.52 |
| Soybean meal, 48% CP | 19.00 | 21.50 | 24.00 |
| Corn, DDGS2 | 0.00 | 15.00 | 30.00 |
| Whey permeate | 20.00 | 12.00 | 0.00 |
| Blood plasma | 4.00 | 1.60 | 0.00 |
| Fish meal | 4.00 | 2.00 | 0.00 |
| Poultry meal | 10.00 | 5.00 | 0.00 |
| Poultry fat | 1.30 | 2.00 | 1.80 |
| l-Lys HCl | 0.31 | 0.40 | 0.45 |
| dl-Met | 0.18 | 0.11 | 0.04 |
| l-Thr | 0.06 | 0.05 | 0.05 |
| Salt | 0.23 | 0.22 | 0.22 |
| Vitamin premix3 | 0.03 | 0.03 | 0.03 |
| Trace mineral premix4 | 0.15 | 0.15 | 0.15 |
| Dicalcium phosphate | 0.00 | 0.20 | 0.62 |
| Limestone | 0.19 | 0.80 | 1.21 |
| Titanium dioxide | 0.00 | 0.00 | 0.40 |
| Xylanase premix5 | 0.50 | 0.50 | 0.50 |
| Calculated composition | |||
| DM, % | 90.81 | 90.30 | 89.21 |
| ME, kcal/kg | 3,436 | 3,428 | 3,376 |
| CP, % | 25.23 | 23.99 | 23.50 |
| EE, % | 5.26 | 6.73 | 7.47 |
| SID6 Lys, % | 1.50 | 1.35 | 1.23 |
| SID Cys + Met, % | 0.82 | 0.74 | 0.68 |
| SID Trp, % | 0.26 | 0.23 | 0.21 |
| SID Thr, % | 0.88 | 0.79 | 0.73 |
| AX7, % | 2.69 (0.41) | 5.46 (1.18) | 8.36 (1.96) |
| Ca, % | 0.85 | 0.80 | 0.70 |
| STTD8 P, % | 0.49 | 0.40 | 0.33 |
| Total P, % | 0.74 | 0.64 | 0.57 |
| Analyzed composition, % (as DM basis) | |||
| DM | 89.29 | 88.47 | 87.35 |
| CP | 24.34 | 23.23 | 23.14 |
| EE | 5.02 | 5.24 | 5.39 |
| ADF | 2.93 | 3.70 | 5.25 |
| NDF | 8.20 | 9.91 | 13.09 |
| Ca | 0.97 | 0.87 | 0.79 |
| Total P | 0.82 | 0.69 | 0.65 |
Diets in each phase were supplemented with increasing supplementation of 0, 30, 60, 120, and 240 g/ton of xylanase or 0, 220, 440, 880, and 1,760 XU per kg feed.
DDGS, distillers dried grains with solubles.
The vitamin premix provided per kg of complete diet: 6,614 IU of vitamin A as vitamin A acetate, 992 IU of vitamin D3, 19.8 IU of vitamin E, 2.64 mg of vitamin K as menadione sodium bisulfite, 0.03 mg of vitamin B12, 4.63 mg of riboflavin, 18.52 mg of d-pantothenic acid as calcium panthonate, 24.96 mg of niacin, and 0.07 mg of biotin.
The trace mineral premix provided per kg of complete diet: 33 mg of Mn as manganous oxide, 110 mg of Fe as ferrous sulfate, 110 mg of Zn as zinc sulfate, 16.5 mg of Cu as copper sulfate, 0.30 mg of I as ethylenediamine dihydroiodide, and 0.30 mg of Se as sodium selenite.
Xylanase enzyme mixed with corn.
SID, standardized ileal digestibility.
AX, arabinoxylan values were given by Bach Knudsen (2014) and Tiwari et al. (2018). Values inside parentheses denote the soluble portion of NSP. Values outside parentheses denote the insoluble portion of NSP.
STTD, standardized total tract digestible.