Table 1.
Composition of basal diets and nutrient levels1
| Items | Starter phase (1–21 d) | Finisher phase (22–42 d) |
|---|---|---|
| Ingredients (%) | ||
| Corn | 55.62 | 60.99 |
| Soybean meal, 44% crude protein | 32.20 | 26.83 |
| Fish meal, 64% crude protein | 4.00 | 4.00 |
| Soybean oil | 3.86 | 4.33 |
| Limestone | 1.27 | 1.18 |
| Dicalcium phosphate | 1.31 | 1.08 |
| Salt | 0.35 | 0.35 |
| Premix2 | 1.00 | 1.00 |
| L-lysine·HCl, 78% | 0.11 | 0.09 |
| DL-methionine, 98% | 0.28 | 0.15 |
| Total | 100.00 | 100.00 |
| Nutrient levels | ||
| Metabolic energy (kcal/g) | 3.00 | 3.10 |
| Crude protein (%) | 21.50 | 19.50 |
| Calcium (%) | 1.00 | 0.90 |
| Available phosphorus (%) | 0.45 | 0.40 |
| Lysine (%) | 1.30 | 1.15 |
| Methionine (%) | 0.65 | 0.50 |
| Analyzed composition | ||
| Crude protein (%) | 21.56 | 19.51 |
| Calcium (%) | 1.01 | 0.88 |
| Phosphorus (%) | 0.68 | 0.58 |
| Lysine (%) | 1.33 | 1.14 |
| Methionine (%) | 0.66 | 0.52 |
1
The basal pretreatment diet and treatment diets were the same. Treatment diets were supplemented with 100 mg/kg Forsythia suspensa extract, or chlortetracycline (80 mg/kg for the starter birds and 50 mg/kg for the finisher birds) to the basal diet as part of the premix.
2
The premix provided the following per kilogram of compound feed: zinc, 60 mg; iron, 95 mg; manganese, 80 mg; copper, 10 mg; iodine, 0.35 mg; selenium, 0.3 mg; vitamin A, 10,000 IU; vitamin D3, 2,750 IU; vitamin E, 30 IU; vitamin K3, 2 mg; vitamin B12, 12 μg; riboflavin, 6 mg; nicotinic acid, 40 mg; pantothenic acid, 12 mg; pyridoxine, 3 mg; biotin, 0.2 mg; choline chloride, 800 mg.