Table 7.
Effects of dietary supplementation of glutamic acid to reduced protein diets on fecal gases emission in weanling pigs at d 21 and 42 (μg/mL). 1,2
| Item | PC | NC | NC1 | NC2 | NC3 | NC4 | SEM |
P-value |
||
|---|---|---|---|---|---|---|---|---|---|---|
| PC vs. NC | Linear | Quadratic | ||||||||
| d 21 | ||||||||||
| NH3 | 1.25 | 0.88 | 1.00 | 1.13 | 1.38 | 1.50 | 0.29 | 0.370 | 0.082 | 0.904 |
| H2S | 1.00 | 0.85 | 0.90 | 1.03 | 0.90 | 0.95 | 0.14 | 0.451 | 0.609 | 0.589 |
| Methyl mercaptans | 2.00 | 1.50 | 1.50 | 2.00 | 1.75 | 1.88 | 0.38 | 0.364 | 0.396 | 0.716 |
| Acetic acid | 6.88 | 6.13 | 6.25 | 7.13 | 6.38 | 6.75 | 0.51 | 0.311 | 0.438 | 0.589 |
| d 42 | ||||||||||
| NH3 | 1.50 | 1.38 | 1.38 | 1.50 | 1.63 | 1.75 | 0.20 | 0.657 | 0.154 | 0.754 |
| H2S | 1.13 | 1.05 | 1.03 | 1.08 | 1.18 | 1.13 | 0.19 | 0.780 | 0.632 | 1.000 |
| Methyl mercaptans | 2.25 | 1.88 | 1.63 | 1.88 | 2.50 | 2.38 | 0.29 | 0.369 | 0.054 | 0.559 |
| Acetic acid | 6.88 | 6.75 | 6.63 | 6.75 | 7.38 | 7.00 | 0.45 | 0.848 | 0.381 | 1.000 |
1
Values represent the means of 4 pens with 2 pigs per pen.
2
PC (positive control), the basal standard protein diet with the Lys-to-Glu ratio at 1:2.35; NC (negative control), NC1, NC2, NC3, and NC4, the basal diet with 2% CP reduction and Lys-to-Glu ratios at 1:2.25, 1:2.30, 1:2.35, 1:2.40, and 1:2.45, respectively.