Table 4.
Effects of essential oils on the concentration of ammonia nitrogen (NH3-N, in mg/dL) after 24 h of in vitro incubation.
| Essential Oils | Doses (mg/dL) | M | SEM | p-Value | ||||
|---|---|---|---|---|---|---|---|---|
| 0 | 50 | 250 | 500 | L | Q | |||
| Star anise | 17.08 | 15.59 | 16.44 | 16.67 | 16.45 | 0.63 | 0.439 | 0.747 |
| Citronella | 17.08 | 16.00 | 17.92 | 18.99 | 17.50 | 0.72 | 0.010 1 | 0.041 |
| Clove bud | 17.08 | 16.19 | 17.14 | 17.27 | 16.92 | 0.60 | 0.232 | 0.476 |
| Globulus | 17.08 | 16.10 | 14.72 | 14.51 | 15.60 | 1.46 | 0.355 | 0.616 |
| Staigeriana | 17.08 | 15.67 | 14.91 | 17.41 | 16.27 | 0.86 | 0.391 | 0.192 |
| Ginger | 17.08 | 17.72 | 16.37 | 14.08 | 16.31 | 1.17 | 0.083 | 0.192 |
| Ho wood | 17.08 | 15.93 | 16.32 | 18.77 | 17.03 | 0.64 | 0.009 2 | 0.039 |
| Melaleuca | 17.08 | 14.68 | 15.55 | 16.06 | 15.84 | 1.48 | 0.911 | 0.960 |
| Oregano | 17.08 | 16.80 | 16.60 | 16.33 | 16.70 | 1.02 | 0.698 | 0.903 |
| White thyme | 17.08 | 15.22 | 15.57 | 15.81 | 15.92 | 1.10 | 0.847 | 0.857 |
L = Linear effect; M = Means; Q = Quadratic effect; SEM = Standard error of the mean. * Equations: 1 y = 16.10 + 0.006x; 2 y = 15.47 + 0.0005x.