Table 1.
Composition of the basal diet (as-fed basis)
| Component | Content |
|---|---|
| Ingredient (%) | |
| Corn | 33.16 |
| Barley | 8.0 |
| Soybean meal | 10.0 |
| Dehulled soybean meal | 10.0 |
| Fermented soybean | 4.15 |
| Sweet whey | 12.56 |
| Lactose | 4.20 |
| Fish meal | 5.00 |
| Wheat bran | 3.00 |
| Sugar | 3.00 |
| Soy oil | 3.00 |
| Organic acids | 0.70 |
| Limestone | 0.30 |
| Monocalcium phosphate | 1.20 |
| Salt | 0.30 |
| Vitamin premix1) | 0.15 |
| Mineral premix2) (Zn-free) | 0.20 |
| Others3) | 0.77 |
| Total4) | 99.69 |
| Calculated chemical composition | |
| Digestible energy (Mcal/kg) | 3.50 |
| Crude protein (%) | 18.50 |
| Ether extract (%) | 4.50 |
| Lysine (%) | 1.52 |
Provided per kg: 1,500 IU vitamin A; 2,000 IU vitamin D3; 65 IU vitamin E; 1.5 mg vitamin K; 1.0 mg thiamin; 6 mg riboflavin; 20 mg pantothenic acid; 25 mg niacin; 1.5 mg vitamin B6; 1 mg folic acid; 25 μg vitamin B12; 25 μg biotin; and 150 mg choline.
Provided per kg: 160 mg Cu; 200 mg Fe; 40 mg Mn; 1.0 mg I; 0.15 mg Co; and 0.4 mg Se.
Provided per total weight: 0.10% choline-HCl; 0.35% L-lysine-HCl (78%); 0.15% DL-methionine (99%); 0.11% L-threonine (99%); 0.01% L-tryptophan; and 0.05% ethoxyquin.
Five experimental diets were supplemented to the basal diet with 125 mg ZnO; 3,125 mg ZnO; 139 mg of 10% lipid (w/w)-coated ZnO (Shield Zn [SZ], CTCBIO, Seoul); 278 mg SZ; and 556 mg SZ per kg diet, respectively, as well as 0 to 0.30% corn, to provide 100, 2,500, 100, 200, and 400 mg Zn/kg, respectively.