Table 4.
Effect of dietary keratinase on apparent metabolic rate of nutrients in broilers.1
| Control | 100,000 U/kg keratinase | 200,000 U/kg keratinase | P valuelinear | P valuequadratic | |
|---|---|---|---|---|---|
| Gross energy, % | 76.8 ± 5.4 | 77.7 ± 5.5 | 79.2 ± 2.3 | 0.280 | 0.556 |
| Crude protein, % | 63.4 ± 8.3 | 65.4 ± 8.23 | 66.8 ± 3.5 | 0.306 | 0.595 |
| Ash, % | 31.1 ± 10.9a | 27.6 ± 15.9a | 45.1 ± 13.1b | 0.046 | 0.031 |
| Calcium, % | 69.0 ± 5.8a | 74.4 ± 7.9ab | 75.1 ± 4.4b | 0.047 | 0.095 |
| Phosphorus, % | 34.4 ± 12.3 | 36.8 ± 9.1 | 36.0 ± 5.9 | 0.724 | 0.867 |
1
Values are means ± SD, n = 9. Means in a row with different superscript letters are different, P < 0.05.