Table 1.
Composition and nutrient levels of layer diets from 25 to 34 wk of age.
| Item1 | Control2 | LCP2 + L-Serine |
|||
|---|---|---|---|---|---|
| 0 | 0.114 | 0.306 | 0.498 | ||
| Ingredient, % | |||||
| Corn | 64.97 | 67.00 | 67.05 | 67.10 | 67.15 |
| Soybean meal | 24.10 | 16.50 | 16.22 | 15.75 | 15.29 |
| Wheat bran | 0 | 4.59 | 4.60 | 4.63 | 4.65 |
| Dicalcium phosphorate | 0.81 | 0.87 | 0.88 | 0.88 | 0.89 |
| Lime stone | 9.00 | 9.02 | 9.02 | 9.02 | 9.02 |
| Salt | 0.30 | 0.30 | 0.30 | 0.30 | 0.30 |
| DL-Methionine, 98% | 0.170 | 0.193 | 0.194 | 0.197 | 0.199 |
| L-Lysine-HCl, 78% | 0.030 | 0.214 | 0.222 | 0.236 | 0.250 |
| L-Threonine, 98% | 0.050 | 0.129 | 0.133 | 0.140 | 0.146 |
| L-Tryptophan, 99% | 0.010 | 0.038 | 0.039 | 0.041 | 0.044 |
| L-Valine, 99% | 0.020 | 0.116 | 0.121 | 0.129 | 0.137 |
| L-Isoleucine, 98% | 0 | 0.105 | 0.110 | 0.118 | 0.126 |
| L-Cysteine•H2O, 68% | 0.180 | 0.208 | 0.210 | 0.213 | 0.217 |
| L-Leucine, 99% | 0 | 0.162 | 0.169 | 0.183 | 0.196 |
| L-Serine, 98% | 0 | 0 | 0.114 | 0.306 | 0.498 |
| Premix3 | 0.23 | 0.23 | 0.23 | 0.23 | 0.23 |
| Choline chloride, 50% | 0.10 | 0.10 | 0.10 | 0.10 | 0.10 |
| Phytase | 0.03 | 0.03 | 0.03 | 0.03 | 0.03 |
| Zeolite | 0 | 0.195 | 0.263 | 0.393 | 0.527 |
| Total | 100 | 100 | 100 | 100 | 100 |
| Nutrient level4, % | |||||
| Metabolizable energy, kcal/kg | 2688 (2719) | 2688 (2601) | 2688 (2640) | 2688 (2773) | 2688 (2711) |
| Crude protein | 16.49 (16.93) | 14.05 (14.07) | 14.05 (14.12) | 14.05 (14.04) | 14.05 (13.90) |
| Calcium | 3.526 (4.275) | 3.526 (4.013) | 3.526 (3.964) | 3.526 (3.520) | 3.526 (3.965) |
| Available phosphorus | 0.319 (0.345) | 0.319 (0.401) | 0.319 (0.382) | 0.319 (0.362) | 0.319 (0.337) |
| SID Lysine | 0.759 (0.739) | 0.759 (0.752) | 0.759 (0.760) | 0.759 (0.748) | 0.759 (0.766) |
| SID Methionine | 0.389 (0.397) | 0.389 (0.376) | 0.389 (0.403) | 0.389 (0.386) | 0.389 (0.401) |
| SID Methionine + cysteine | 0.746 (0.740) | 0.746 (0.721) | 0.746 (0.747) | 0.746 (0.731) | 0.746 (0.725) |
| SID Threonine | 0.565 (0.555) | 0.565 (0.511) | 0.565 (0.526) | 0.565 (0.561) | 0.565 (0.544) |
| SID Tryptophan | 0.173 (0.179) | 0.173 (0.167) | 0.173 (0.180) | 0.173 (0.174) | 0.173 (0.182) |
| SID Valine | 0.709 (0.706) | 0.709 (0.664) | 0.709 (0.691) | 0.709 (0.662) | 0.709 (0.708) |
| SID Isoleucine | 0.608 (0.597) | 0.608 (0.543) | 0.608 (0.560) | 0.608 (0.549) | 0.608 (0.614) |
| SID Leucine | 1.289 (1.319) | 1.289 (1.258) | 1.289 (1.300) | 1.289 (1.339) | 1.289 (1.327) |
| SID Phenylalanine | 0.734 (0.766) | 0.618 (0.598) | 0.612 (0.628) | 0.603 (0.685) | 0.594 (0.585) |
| SID Arginine | 0.963 (0.962) | 0.795 (0.763) | 0.787 (0.748) | 0.774 (0.768) | 0.760 (0.725) |
| SID Histidine | 0.406 (0.425) | 0.354 (0.344) | 0.351 (0.365) | 0.347 (0.347) | 0.342 (0.338) |
| SID Glycine | 0.567 (0.556) | 0.493 (0.512) | 0.489 (0.530) | 0.482 (0.520) | 0.475 (0.525) |
| SID Serine | 0.719 (0.749) | 0.613 (0.598) | 0.719 (0.709) | 0.899 (0.874) | 1.079 (1.084) |
| SID Glycine + serine | 1.286 (1.305) | 1.106 (1.110) | 1.208 (1.239) | 1.381 (1.394) | 1.554 (1.609) |
Abbreviations: HCl, hydrochloride; SID, standardized ileal digestible.
Control, the control diet (16.49% CP); LCP, the low crude protein diets (14.05% CP).
Premix supplied per kilogram of diet: vitamin A, 12,500 IU; vitamin D3, 4,125 IU; vitamin E, 15 IU; vitamin K3, 2 mg; thiamine, 1 mg; riboflavin, 8.5 mg; pyridoxine, 8 mg; vitamin B12, 0.04 mg; biotin, 0.1 mg; folic acid, 1.25 mg; Ca-pantothenate, 50 mg; niacin, 32.5 mg; copper, 8 mg; zinc, 65 mg; iron, 60 mg; manganese, 65 mg; selenium, 0.3 mg; iodine, 1 mg.
The values in parentheses indicate analyzed values. Others are calculated values. Data for the nutrients were calculated values. SID AAs data were calculated using SID coefficients of database from AminoDat 4.0 (2010).