Table 7.
The effect of lowering dietary crude protein and adding synthetic amino acids on cumulative gas emission per animal unit
| Diet | SE | P | |||
|---|---|---|---|---|---|
| Control | 1X | 2X | |||
| NH3(g/AU) | |||||
| 7 to 14 | 302.36 | 251.51 | 245.99 | 938.05 | 0.9989 |
| 7 to 28 | 1,360.10 | 1,093.88 | 862.77 | 938.05 | 0.9321 |
| 7 to 42 | 2,610.48 | 1,870.53 | 1,393.08 | 938.05 | 0.6515 |
| 7 to 63 | 4,689.79 | 3,043.06 | 2,101.07 | 938.05 | 0.1502 |
| 7 to 84 | 6,405.34a | 4,156.01ab | 2,691.19b | 938.05 | 0.0234 |
| 7 to 105 | 7,675.14a | 5,168.32ab | 3,255.19b | 938.05 | 0.0057 |
| 7 to 126 | 8,759.33a | 5,920.58b | 3,711.57b | 938.05 | 0.0014 |
| 7 to 140 | 9,620.70a | 6,437.73b | 4,058.76b | 938.05 | 0.0004 |
| 7 to 147 | 9,311.67a | 5,995.66b | 4,056.06b | 1,078.82 | 0.0038 |
| CO2 (kg/AU) | |||||
| 7 to 14 | 179.73 | 190.89 | 180.92 | 69.02 | 0.9921 |
| 7 to 28 | 452.38 | 507.49 | 445.62 | 69.02 | 0.7859 |
| 7 to 42 | 644.28 | 698.50 | 636.92 | 69.02 | 0.7893 |
| 7 to 63 | 874.80 | 923.22 | 880.71 | 69.02 | 0.864 |
| 7 to 84 | 1,094.35 | 1,144.94 | 115.21 | 69.02 | 0.8734 |
| 7 to 105 | 1,277.33 | 1,339.09 | 1,313.73 | 69.02 | 0.8173 |
| 7 to 126 | 1,431.60 | 1,497.22 | 1,480.46 | 69.02 | 0.7842 |
| 7 to 140 | 1,529.92 | 1,596.74 | 1,585.47 | 69.02 | 0.7653 |
| 7 to 147 | 1,567.13 | 1,600.84 | 1,623.50 | 75.82 | 0.8696 |
| N2O (mg/AU) | |||||
| 7 to 14 | 18,011 | 11,519 | 14,141 | 9,002.10 | 0.8769 |
| 7 to 28 | 47,704 | 38,595 | 37,326 | 9,002.10 | 0.6750 |
| 7 to 42 | 66,248 | 54,767 | 54,340 | 9,002.10 | 0.5722 |
| 7 to 63 | 85,701 | 72,846 | 73,555 | 9,002.10 | 0.5283 |
| 7 to 84 | 99,493 | 86,729 | 88,816 | 9,002.10 | 0.5636 |
| 7 to 105 | 111,181 | 99,198 | 101,659 | 9,002.10 | 0.6123 |
| 7 to 126 | 121,831 | 110,147 | 113,472 | 9,002.10 | 0.6413 |
| 7 to 140 | 128,658 | 117,096 | 121,176 | 9,002.10 | 0.6560 |
| 7 to 147 | 130,083 | 117,750 | 122,278 | 9,499.10 | 0.6515 |
| H2S (g/AU) | |||||
| 7 to 14 | 4.43 | 7.40 | 4.57 | 77.13 | 0.9995 |
| 7 to 28 | 23.36 | 27.89 | 28.03 | 77.13 | 0.9988 |
| 7 to 42 | 46.91 | 59.64 | 63.96 | 77.13 | 0.9869 |
| 7 to 63 | 113.53 | 156.20 | 195.19 | 77.13 | 0.7564 |
| 7 to 84 | 208.38 | 256.89 | 369.30 | 77.13 | 0.2097 |
| 7 to 105 | 340.31 | 404.28 | 554.74 | 77.13 | 0.1386 |
| v7 to 126 | 482.99 | 538.18 | 691.86 | 77.13 | 0.1477 |
| 7 to 140 | 542.58 | 594.25 | 747.42 | 77.13 | 0.1566 |
| 7 to 147 | 544.53 | 488.43 | 739.25 | 95.14 | 0.1551 |
| CH4(g/AU) | |||||
| 63 to 84 | 3,694.07 | 5,153.01 | 4,222.78 | 1,565.48 | 0.8017 |
| 63 to 105 | 6,809.66 | 9,845.81 | 7,678.43 | 1,565.48 | 0.3806 |
| 63 to 126 | 9,586.62 | 13,316.00 | 11,508.00 | 1,565.48 | 0.2576 |
| 63 to 140 | 11,129.00 | 15,379.00 | 14,279.00 | 1,565.48 | 0.1549 |
| 63 to 147 | 11,772.00 | 15,620.00 | 16,320.00 | 1,745.38 | 0.1572 |
Values with different superscripts, within a row are different (P < 0.05).