Table 1.
Composition and nutritional profile of the diets offered during the experimental period1,2
| Item, % dry matter (DM) | ADAP-1 | ADAP-2 | FIN |
|---|---|---|---|
| Sugarcane bagasse | 25.0 | 20.0 | 8.5 |
| Ground corn | 37.8 | 42.8 | 54.3 |
| Corn gluten feed | 20.0 | 20.0 | 20.0 |
| Whole cottonseed | 15.0 | 15.0 | 15.0 |
| Urea | 0.2 | 0.2 | 0.2 |
| Mineral-vitamin mix3 | 2.0 | 2.0 | 2.0 |
| Nutritional profile | |||
| DM | 69.1 | 72.5 | 81.8 |
| Crude protein, % DM | 13.0 | 13.2 | 13.8 |
| Ether extract, % DM | 5.3 | 5.4 | 5.8 |
| Neutral detergent fiber, % DM | 36.8 | 33.5 | 25.9 |
| Starch | 31.2 | 34.7 | 42.9 |
| Total digestible nutrients, % DM4 | 74.5 | 76.7 | 81.5 |
| Metabolizable energy, Mcal/kg5 | 2.69 | 2.77 | 2.94 |
| Net energy for maintenance, Mcal/kg5 | 1.79 | 1.86 | 2.03 |
| Net energy for gain, Mcal/kg5 | 1.15 | 1.21 | 1.36 |
1Experimental period lasted 119 d.
2ADAP-1: adaptation diet (step-up 1) offered for 7 d to CONT and MEG-14 and for 3 d to MEG-6; ADAP-2: adaptation diet (step-up 2) offered for 7 d to CONT and MEG-14 and for 3 d to MEG-6. FIN: finishing diet offered for all animals following or not an adaptation diet.
3Mineral-vintamin mix (MCassab Comércio e Indústria; São Paulo, SP, Brazil) contained 21.0% Ca, 2.0% Mg, 15.0% Na, 23.1% Cl, 750 ppm Cu, 2,000 ppm Mn, 3,000 ppm Zn, 16.7 ppm Co, 30 ppm I, 5 ppm Se, 115 IU Vitamin A, 14 IU Vitamin D3, 180 IU Vitamin E, and 1,500 ppm sodium monensin (Rumensin; Elanco Animal Health, São Paulo, SP, Brazil).
4Calculated according to Weiss et al. (1992) and chemical composition of ingredients.
5Estimated with the equations proposed by NRC (1996; Level 1) with the addition of ionophore (sodium monensin) and using the TDN values, which had been calculated with equation proposed by Weiss et al. (1992).