Table 7. Study D: composition and calculated analysis of creep feed, starter (0–14 d of age) and grower diets (15–42 d of age).
| Ingredient/Nutrient | Units | Creep feed1 | Starter diet | Grower diet | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| T1 Control (no Fe added) | T2 Ferrous (II) sulphate2 | T3 Ferric (III) oxide2 | T4 Ferric citrate3 | T5 Ferric citrate + ferrous (II) sulphate4 | T1 Control (no Fe added) | T2 Ferrous (II) sulphate2 | T3 Ferric (III) oxide2 | T4 Ferric citrate3 | T5 Ferric citrate + ferrous (II) sulphate4 | |||
| Corn | % | 50.57 | 63.46 | 63.46 | 63.46 | 63.46 | 63.46 | 70.70 | 70.70 | 70.70 | 70.70 | 70.70 |
| Soybean meal (CP 49%) | 24.38 | 19.80 | 19.80 | 19.80 | 19.80 | 19.80 | 21.51 | 21.51 | 21.51 | 21.51 | 21.51 | |
| Skimmed milk powder | 20.00 | 10.00 | 10.00 | 10.00 | 10.00 | 10.00 | – | – | – | – | – | |
| Mineral & vitamin premix* | 1.20 | 1.20 | 1.20 | 1.20 | 1.20 | 1.20 | 1.20 | 1.20 | 1.20 | 1.20 | 1.20 | |
| Calcium carbonate | 1.15 | 1.38 | 1.38 | 1.38 | 1.38 | 1.38 | 1.43 | 1.43 | 1.43 | 1.43 | 1.43 | |
| Monocalcium phosphate | 1.10 | 1.40 | 1.40 | 1.40 | 1.40 | 1.40 | 1.60 | 1.60 | 1.60 | 1.60 | 1.60 | |
| Soybean oil | 1.00 | 0.54 | 0.54 | 0.54 | 0.54 | 0.54 | 1.17 | 1.17 | 1.17 | 1.17 | 1.17 | |
| L-lysine HCL | 0.30 | 0.60 | 0.60 | 0.60 | 0.60 | 0.60 | 0.57 | 0.57 | 0.57 | 0.57 | 0.57 | |
| DL-methionine | 0.20 | 0.23 | 0.23 | 0.23 | 0.23 | 0.23 | 0.17 | 0.17 | 0.17 | 0.17 | 0.17 | |
| Cellulose | – | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | |
| L-Threonine | 0.19 | 0.19 | 0.19 | 0.19 | 0.19 | 0.19 | 0.17 | 0.17 | 0.17 | 0.17 | 0.17 | |
| L-tryptophan | 0.10 | 0.10 | 0.10 | 0.10 | 0.10 | 0.10 | 0.08 | 0.08 | 0.08 | 0.08 | 0.08 | |
| Titanium (IV) dioxide | 0 | 0 | 0 | 0 | 0 | 0 | 0.10 | 0.10 | 0.10 | 0.10 | 0.10 | |
| Corn starch or ferric source | 0 | 0 | 0.10 | 0.10 | 0.10 | 0.10 | 0 | 0.10 | 0.10 | 0.10 | 0.10 | |
| TOTAL | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | |
| AMEN** | MJ/kg | 13.91 | 13.42 | 13.42 | 13.42 | 13.42 | 13.42 | 13.40 | 13.40 | 13.40 | 13.40 | 13.40 |
| Crude protein | % | 24.00 | 20.00 | 20.00 | 20.00 | 20.00 | 20.00 | 18.00 | 18.00 | 18.00 | 18.00 | 18.00 |
| Lysine | 1.65 | 1.51 | 1.51 | 1.51 | 1.51 | 1.51 | 1.29 | 1.29 | 1.29 | 1.29 | 1.29 | |
| Methionine | – | 0.57 | 0.57 | 0.57 | 0.57 | 0.57 | 0.44 | 0.44 | 0.44 | 0.44 | 0.44 | |
| Methionine/Cysteine | 0.98 | 0.87 | 0.87 | 0.87 | 0.87 | 0.87 | 0.74 | 0.74 | 0.74 | 0.74 | 0.74 | |
| Tryptophan | 0.37 | 0.30 | 0.30 | 0.30 | 0.30 | 0.30 | 0.25 | 0.25 | 0.25 | 0.25 | 0.25 | |
| Threonine | 0.96 | 0.94 | 0.94 | 0.94 | 0.94 | 0.94 | 0.82 | 0.82 | 0.82 | 0.82 | 0.82 | |
| Valine | – | – | – | – | – | – | – | – | – | – | – | |
| Arginine | – | – | – | – | – | – | – | – | – | – | – | |
| Crude fibre | 1.94 | 2.74 | 2.74 | 2.74 | 2.74 | 2.74 | 2.96 | 2.96 | 2.96 | 2.96 | 2.96 | |
| Crude fat | 3.65 | 3.50 | 3.50 | 3.50 | 3.50 | 3.50 | 4.39 | 4.39 | 4.39 | 4.39 | 4.39 | |
| Starch | – | – | – | – | – | – | – | – | – | – | – | |
| Crude ash | – | 5.63 | 5.63 | 5.63 | 5.63 | 5.63 | 5.28 | 5.28 | 5.28 | 5.28 | 5.28 | |
| Calcium | 0.96 | 0.95 | 0.95 | 0.95 | 0.95 | 0.95 | 0.88 | 0.88 | 0.88 | 0.88 | 0.88 | |
| Phosphorus | 0.75 | 0.45 | 0.45 | 0.45 | 0.45 | 0.45 | 0.40 | 0.40 | 0.40 | 0.40 | 0.40 | |
| Digestible phosphorus | 0.48 | |||||||||||
| Sodium | 2.20 | 0.24 | 0.24 | 0.24 | 0.24 | 0.24 | 1.76 | 1.76 | 1.76 | 1.76 | 1.76 | |
| Fe source | mg/kg feed | 0 | 0 | ca. 266 | 266 | 550 | 550 + ca. 266 | 0 | ca. 266 | 266 | 550 | 550 + ca. 266 |
| Target added Fe | mg/kg feed | Only endogenous Fe | 0 | 85 | 85 | 85 | 170 | 0 | 85 | 85 | 85 | 170 |
Notes:
Contents per kg premix: 400,000 I.U. vit. A (acetate); 120,000 I.U. vit. D3; 8,000 mg vit. E (a-tocopherol acetate); 200 mg vit. K3 (MSB); 250 mg vit. B1 (mononitrate); 420 mg vit. B2 (cryst. riboflavin); 2,500 mg niacin (niacinamide); 400 mg Vit. B6 (HCl); 2,000 μg vit. B12; 25,000 μg Biotin (commercial, feed grade); 1,000 mg pantothenic acid (Ca d-pantothenate); 100 mg folic acid (cryst. commercial feed grade); 80,000 mg choline (chloride); 5,000 mg Zn (sulphate); 6,000 mg Mn (sulphate); 1,000 mg Cu (sulphate-pentahydrate); 20 mg Se (Na-selenite); 45 mg I (Ca-iodate); 130 g Na (NaCl); 55 g Mg (sulphate).
Metabolisable Energy, calculated as per DLG (2013).
Pre-weaning creep feed with no added Fe.
Fe added as per commercial practice, 85 mg Fe/kg feed.
500 mg ferrous citrate plus 50 mg microtracer per kg feed, supplying 85 mg Fe/kg feed.
85 mg Fe/kg feed from ferrous citrate + 85 Fe mg/kg feed from ferrous (II) sulfate.