Table 1.
Composition of experimental diets to broilers from 1 to 7 d of age
| Item (%) | R1 | R2 | R3 | R4 | R5 | R6 | R7 | R8 |
|---|---|---|---|---|---|---|---|---|
| Corn | 55.43 | 52.56 | 54.89 | 56.12 | 55.68 | 55.38 | 54.05 | 56.21 |
| Soybean meal (45% CP) | 37.57 | 38.11 | 37.67 | 37.44 | 37.52 | 37.58 | 37.83 | 37.42 |
| Soybean oil | 2.60 | 4.92 | 3.03 | 2.03 | 2.38 | 2.63 | 3.71 | 1.95 |
| Salt | 0.52 | 0.52 | 0.52 | 0.52 | 0.52 | 0.52 | 0.52 | 0.52 |
| Dicalcium phosphate | 2.04 | 2.04 | 2.04 | 2.04 | 2.04 | 2.04 | 2.04 | 2.04 |
| Limestone | 0.90 | 0.89 | 0.89 | 0.90 | 0.90 | 0.90 | 0.90 | 0.90 |
| Vitamin premix1 | 0.05 | 0.05 | 0.05 | 0.05 | 0.05 | 0.05 | 0.05 | 0.05 |
| Trace mineral premix2 | 0.05 | 0.05 | 0.05 | 0.05 | 0.05 | 0.05 | 0.05 | 0.05 |
| L-Lys HCl (78%) | 0.30 | 0.29 | 0.30 | 0.31 | 0.31 | 0.30 | 0.30 | 0.31 |
| DL-Met (99%) | 0.33 | 0.34 | 0.33 | 0.33 | 0.33 | 0.33 | 0.34 | 0.33 |
| L-Thr (98%) | 0.11 | 0.11 | 0.11 | 0.11 | 0.11 | 0.11 | 0.11 | 0.11 |
| Choline chloride (60%) | 0.05 | 0.05 | 0.05 | 0.05 | 0.05 | 0.05 | 0.05 | 0.05 |
| Lasalocid (15%) | 0.06 | 0.06 | 0.06 | 0.06 | 0.06 | 0.06 | 0.06 | 0.06 |
| Bacitracin zinc (15%) | 0.03 | 0.03 | 0.03 | 0.03 | 0.03 | 0.03 | 0.03 | 0.03 |
| Composition (in dry matter basis) | ||||||||
| GE (kcal/kg)3 | 4,449 | 4,569 | 4,505 | 4,442 | 4,457 | 4,463 | 4,500 | 4,407 |
| AMEn (kcal/kg)4 | 3,329 | 3,321 | 3,323 | 3,334 | 3,335 | 3,325 | 3,309 | 3,317 |
| Crude protein (%)3 | 24.73 | 24.83 | 24.56 | 25.76 | 25.63 | 23.57 | 24.40 | 24.09 |
| Digestible Lys (%)4 | 1.50 | 1.50 | 1.50 | 1.50 | 1.50 | 1.50 | 1.49 | 1.50 |
| Digestible Met+cyst (%)4 | 1.07 | 1.06 | 1.06 | 1.07 | 1.07 | 1.06 | 1.06 | 1.06 |
| Digestible Thr (%)4 | 0.98 | 0.97 | 0.97 | 0.98 | 0.98 | 0.98 | 0.97 | 0.97 |
| Calcium (%)4 | 1.06 | 1.06 | 1.06 | 1.06 | 1.06 | 1.06 | 1.05 | 1.06 |
| Available P (%)4 | 0.53 | 0.53 | 0.53 | 0.53 | 0.53 | 0.53 | 0.53 | 0.53 |
| Ether extract (%)3 | 6.80 | 9.25 | 7.25 | 6.20 | 6.57 | 6.83 | 7.94 | 6.09 |
| Crude fiber (%)3 | 3.99 | 3.95 | 3.98 | 4.01 | 4.00 | 3.98 | 3.95 | 3.98 |
| NDF (%)3 | 11.34 | 11.02 | 11.24 | 11.52 | 11.45 | 11.37 | 11.12 | 11.44 |
| ADF (%)3 | 6.35 | 6.31 | 6.33 | 6.37 | 6.38 | 6.35 | 6.30 | 6.35 |
| Ash (%)3 | 2.90 | 2.90 | 2.91 | 2.90 | 2.91 | 2.90 | 2.88 | 2.89 |
| Electrolyte balance (mEq/kg)5 | 213 | 214 | 213 | 213 | 213 | 213 | 213 | 213 |
R1 = Elaborated diet with AMEn value of corn and soybean meal described in Brazilian Tables (Rostagno et al., 2005); R2 = AMEn Values obtained in in vivo assay; R3 = Equations by Janssen (1989); R4 = Equation 1 proposed by Nascimento et al. (2009); R5 = Equation proposed by Mariano et al. (2012); R6 = Equations 2 proposed by Nascimento et al. (2011a; b); R7 = Equations proposed by Rodrigues (2000) and Rodrigues et al. (2002); R8 = Equation proposed by Rostagno et al. (2005).
Contributed per kilogram of diet: 0.8 mg of folic acid, 14.5 mg of pantothenic acid, 0.03 mg of biotin, 18.5 mg of niacin, 10,000 IU of vitamin A, 1.5 mg of vitamin B1, 20.25 IU of vitamin E, 13.5 mcg of vitamin B12, 6.0 mg of vitamin B2, 3.0 mg of vitamin B6, 2,500 IU of vitamin D3, 2.0 mg of vitamin K3 and 2.5 mg of BHT.
Contributed per kilogram of diet: 55 mg of zinc, 0.18 mg of selenium, 0.7 mg of iodine, 10 mg of cupper, 78 mg of manganese and 48 mg of iron.
Analyzed at in the Laboratory of Animal Nutrition, University Federal of Lavras (Minas Gerais, Brazil).
Calculated according to Rostagno et al. (2005).
Calculated according to Mongin (1980): (Na+, mEq/kg +K+, mEq/kg]-Cl−, mEq/kg).