Table 8.
The effect of lowering dietary crude protein and adding synthetic amino acids on average daily gas emission per animal unit.
| Diet | SE | P | |||
|---|---|---|---|---|---|
| Control | 1X | 2X | |||
| NH3(g/AU*d) | |||||
| 7 to 14 | 37.7947 | 31.4391 | 30.7483 | 11.745 | 0.9989 |
| 14 to28 | 75.5529 | 60.1691 | 44.056 | 11.745 | 0.9321 |
| 28 to 42 | 89.6702a | 55.4752b | 37.8793b | 11.745 | 0.6515 |
| 42 to63 | 98.7767a | 55.8345b | 33.7137b | 11.745 | 0.1502 |
| 63 to 84 | 81.6927a | 52.9978ab | 28.1012b | 11.745 | 0.0234 |
| 84 to105 | 60.4668 | 48.2051 | 26.857 | 11.745 | 0.0057 |
| 105 to 126 | 51.6286 | 35.8223 | 21.7323 | 11.745 | 0.0014 |
| 126 to 140 | 61.526 | 36.9393 | 24.7669 | 11.745 | 0.0004 |
| 140 to 147 | 46.1848a | 32.7844ab | 20.1072b | 13.755 | 0.0038 |
| CO2(kg/AU*d) | |||||
| 7 to 14 | 22.4663 | 23.8614 | 22.6152 | 1.3093 | 0.9921 |
| 14 to28 | 19.4748 | 22.6143 | 18.907 | 1.3093 | 0.7859 |
| 28 to 42 | 13.7070 | 13.6436 | 13.6646 | 1.3093 | 0.7893 |
| 42 to63 | 10.9773 | 10.7008 | 11.6088 | 1.3093 | 0.8640 |
| 63 to 84 | 10.4551 | 10.5582 | 11.1669 | 1.3093 | 0.8734 |
| 84 to105 | 8.7131 | 9.2452 | 9.4531 | 1.3093 | 0.8173 |
| 105 to 126 | 7.3462 | 7.5299 | 7.9395 | 1.3093 | 0.7842 |
| 126 to 140 | 7.0229 | 7.1088 | 7.5009 | 1.3093 | 0.7653 |
| 140 to 147 | 5.1141 | 5.3319 | 6.153 | 1.7869 | 0.8696 |
| N2O (mg/AU*d) | |||||
| 7 to 14 | 2251.33a | 1439.84b | 1767.57b | 170.82 | 0.8769 |
| 14 to28 | 2120.92 | 1934.01 | 1656.10 | 170.82 | 0.6750 |
| 28 to 42 | 1324.58 | 1155.15 | 1215.33 | 170.82 | 0.5722 |
| 42 to63 | 926.34 | 860.91 | 915.00 | 170.82 | 0.5283 |
| 63 to 84 | 656.76 | 661.08 | 726.71 | 170.82 | 0.5636 |
| 84 to105 | 556.59 | 593.8 | 611.55 | 170.82 | 0.6123 |
| 105 to 126 | 507.14 | 521.38 | 562.54 | 170.82 | 0.6413 |
| 126 to 140 | 487.66 | 496.32 | 550.29 | 170.82 | 0.6560 |
| 140 to 147 | 382.76 | 371.67 | 449.54 | 231.77 | 0.6515 |
| H2S (g/AU*d) | |||||
| 7 to 14 | 0.5547 | 0.9252 | 0.5719 | 0.9839 | 0.9995 |
| 14 to28 | 1.3521 | 1.4638 | 1.6758 | 0.9839 | 0.9988 |
| 28 to 42 | 1.6821 | 2.2683 | 2.5664 | 0.9839 | 0.9869 |
| 42 to63 | 3.1720 | 4.5976 | 6.2488 | 0.9839 | 0.7564 |
| 63 to 84 | 4.5169 | 4.7948 | 9.5766 | 0.9839 | 0.2097 |
| 84 to105 | 6.2820 | 7.0185 | 7.5446 | 0.9839 | 0.1386 |
| 105 to 126 | 6.7945 | 6.3862 | 6.5296 | 0.9839 | 0.1477 |
| 126 to 140 | 4.2564 | 4.0052 | 3.9687 | 0.9839 | 0.1566 |
| 140 to 147 | 3.5629 | 3.2426 | 4.3974 | 1.2008 | 0.1551 |
| CH4(g/AU*d) | |||||
| 63 to 84 | 167.26 | 234.48 | 192.52 | 28.7387 | 0.8017 |
| 84 to 105 | 148.36 | 223.47 | 164.55 | 28.7387 | 0.3806 |
| 105 to 126 | 132.24 | 165.26 | 182.35 | 28.7387 | 0.2576 |
| 126 to 140 | 110.16 | 147.32 | 197.97 | 28.7387 | 0.1549 |
| 140 to 147 | 110.97 | 115.17 | 208.79 | 32.9955 | 0.1572 |
Values with different superscripts, within a row are different (P < 0.05)