Table 1.
Composition of the experimental diets, as-fed basis1
| Feeding phase | |||
|---|---|---|---|
| Ingredient, % | 1 | 2 | 3 |
| Soybean meal, 47% CP | 25.00 | 25.00 | 32.05 |
| Whey permeate2 | 22.00 | 6.10 | — |
| Steamed ground oats | 20.00 | 7.50 | — |
| Corn | 10.50 | 38.72 | 46.61 |
| Corn distillers’ dried grains with solubles | 8.00 | 8.00 | 16.00 |
| Soy protein concentrate3 | 7.00 | 7.00 | — |
| Choice white grease | 3.50 | 3.55 | 1.90 |
| Limestone | 1.12 | 1.07 | 1.08 |
| Monocalcium phosphate | 0.67 | 1.14 | 1.00 |
| Zinc oxide | 0.35 | 0.28 | — |
| Lysine·HCl | 0.40 | 0.40 | 0.44 |
| Salt | 0.35 | 0.40 | 0.40 |
| Organic acid blend4 | 0.30 | 0.10 | 0.10 |
| dl-Methionine | 0.22 | 0.19 | 0.15 |
| Toxin binder5 | 0.20 | 0.20 | — |
| Vitamin and mineral premix6 | 0.15 | 0.15 | 0.15 |
| Pellet binder | 0.10 | 0.10 | — |
| l-Threonine | 0.10 | 0.09 | 0.11 |
| Choline chloride | 0.07 | 0.07 | — |
| Cu chloride | 0.03 | 0.03 | — |
| l-Tryptophan | 0.02 | 0.03 | 0.03 |
| Calculated composition | |||
| ME, Mcal/kg | 3.56 | 3.49 | 3.38 |
| CP, % | 24.12 | 23.53 | 23.92 |
| SID7 lysine, % | 1.46 | 1.43 | 1.40 |
| SID isoleucine, % | 0.93 | 0.89 | 0.86 |
| SID threonine, % | 0.86 | 0.84 | 0.84 |
| SID tryptophan, % | 0.26 | 0.27 | 0.25 |
| SID valine, % | 0.99 | 0.97 | 0.93 |
| Ca, % | 0.82 | 0.80 | 0.75 |
| Available P, % | 0.40 | 0.40 | 0.37 |
| Ca:available P, ratio | 2.07 | 2.03 | 2.08 |
| STTD8 Ca, % | 0.58 | 0.59 | 0.55 |
| STTD P, % | 0.43 | 0.40 | 0.36 |
| STTD Ca:STTD P, ratio | 1.37 | 1.47 | 1.54 |
1Six experimental diets were manufactured by first creating 4 dietary treatments with 0% or 0.30% of inositol with or without 2,500 FTU/kg of phytase for each Phase. Then, diets containing 0.15% of inositol were created on the farm by blending half of diets containing 0% and 0.30% of inositol with or without phytase, using an automated feeding system. The source of phytase was Quantum Blue (AB Vista, Marlborough, UK), and the source of inositol was inositol hexanicotinate (Zhucheng Haotian Pharmaceutical Co., Shandong, China). Analyzed phytase concentrations for Phases 1, 2, and 3 were 605 and 1,940, 632 and 2,120, and 361 and 1,643 FTU/kg, for 0 and 2,500 FTU/kg phytase treatments, respectively.
2Dairy Lac 80 (International ingredients Corp., Monett, MO).
3Soy protein product (ADM, Chicago, IL).
4Aviplus (Vetagro Inc., Chicago, IL).
5Flo-Bond (Brookside Agra, O’Fallon, IL).
6Supplied per kg of complete diet: 105 mg of zinc as zinc sulfate, 100 mg of iron as ferrous sulfate, 45 mg of manganese as manganous oxide, 15 mg of copper as copper sulfate, 0.7 mg of iodine as ethylenediaminedihydroiodide, 0.3 mg of selenium as sodium selenite, 9,923 IU of vitamin A, 1,654 IU of vitamin D3, 77 mg of vitamin E, 3.9 mg of vitamin K, 44.1 µg of vitamin B12, 9.9 mg of riboflavin, 33.1 mg of d-pantothenic acid, 55.1 mg of niacin, 3.3 mg of thiamin, 5.5 mg of pyridoxine, 992 µg of folic acid, and 276 µg of biotin.
7Standardized ileal digestible.
8Standardized total tract digestible.