Table 7. Effect of different diets on energy metabolism in Experiment 2.
| Item | Reference diet | Test diet | SEM | P-value |
|---|---|---|---|---|
| Energy balance (kcal/kg BW0.70/d) | ||||
| THP | 189.85 | 192.02 | 2.25 | 0.656 |
| HI | 82.37 | 84.54 | 2.25 | 0.656 |
| RE | 158.04 | 132.29 | 4.56 | 0.002 |
| RE as protein | 78.97 | 89.81 | 1.64 | <0.001 |
| RE as fat | 79.07 | 42.48 | 5.30 | <0.001 |
| GEI | 453.09 | 453.63 | 3.38 | 0.941 |
| AMEI | 347.89 | 324.31 | 4.43 | 0.005 |
| NEI | 265.53 | 239.77 | 4.56 | 0.002 |
| Available energy (kcal/kg of DM) | ||||
| AME | 3714.12 | 3413.17 | 0.18 | <0.001 |
| AMEn | 3520.65 | 3195.81 | 0.19 | <0.001 |
| NE | 2835.15 | 2524.64 | 0.20 | <0.001 |
| Efficiency (%) | ||||
| AME/GE | 76.78 | 71.49 | 0.81 | <0.001 |
| NE/AME | 76.31 | 73.96 | 0.68 | 0.094 |
Abbreviations: DM, dry matter; Expt. 2, broilers aged 28.30 days; each treatment consisted of six replicates with two broilers each; THP, total heat production; HI, heat increment; RE, retained energy; GEI, gross energy intake; AMEI, apparent metabolizable energy intake; NEI, net energy intake; AME, apparent metabolizable energy; AMEn, AME corrected for zero nitrogen retention; NE, net energy; GE, gross energy; SEM, standard error of the mean (n=6).