Table 4.
The effects of high protein (CON) and low protein (LP) diets during growing (P1) and finishing (P2) phases, on crude protein (CP) intake (CPI), digestible CPI (DCPI), CP conversion ratio (CPCR), digestible CPCR (DCPCR), daily feed cost (DFC), cost of daily gain (CDG) and daily gross margin (DGM) values of young Charolais beef bulls at Rovigo Province, Italy.
| Items | CON | LP | P1 | P2 | CON | LP | SEM | p-Value | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| P1 | P2 | P1 | P2 | Diet | Phase | Diet × Phase | ||||||
| CPI (kg/d) | 1.57 | 1.35 | 1.40 | 1.52 | 1.50 | 1.63 | 1.30 | 1.40 | 0.039 | 0.002 | <0.001 | 0.451 |
| CP faecal excretion (g/d) | 0.746 | 0.671 | 0.575 | 0.842 | 0.596 | 0.895 | 0.553 | 0.788 | 0.040 | 0.131 | <0.001 | 0.297 |
| DCPI (kg/d) | 0.825 | 0.679 | 0.827 | 0.676 | 0.909 | 0.740 | 0.745 | 0.611 | 0.034 | 0.001 | <0.001 | 0.590 |
| CPCR | 1.08 | 1.01 | 0.915 | 1.17 | 0.951 | 1.20 | 0.878 | 1.14 | 0.046 | 0.208 | <0.001 | 0.876 |
| DCPCR | 0.560 | 0.499 | 0.539 | 0.520 | 0.575 | 0.544 | 0.503 | 0.496 | 0.023 | 0.054 | 0.498 | 0.660 |
| DFC (€) | 2.26 | 1.97 | 2.01 | 2.22 | 2.14 | 2.37 | 1.88 | 2.07 | 0.057 | 0.004 | <0.001 | 0.468 |
| CDG (€/kg growth) | 1.55 | 1.48 | 1.31 | 1.72 | 1.35 | 1.74 | 1.27 | 1.69 | 0.067 | 0.370 | <0.001 | 0.820 |
| DGM (€) | 1.28 | 1.29 | 1.67 | 0.900 | 1.66 | 0.900 | 1.68 | 1.90 | 0.118 | 0.943 | <0.001 | 0.937 |