Table 9.
Effects of plant secondary compounds and plant oil on digestibility and methane gas production in various studies
| Substrates | Level | Methane,% | Animal | References |
|---|---|---|---|---|
| Garlic powder |
16 mg |
(−) 22.0* |
Buffalo (fluid) |
[55] |
| Coconut oil |
16 mg |
(+) 6.4* |
Buffalo (fluid) |
[55] |
| Soapberry fruit and mangosteen peel pellet |
4% |
10.0 |
Holstein heifers |
[25] |
| Mangosteen peel powder |
100 g/hd/d |
(−) 10.5 |
Beef cattle |
[51] |
| Coconut oil |
7% |
(+) 39.5* |
Beef cattle |
[51] |
| Coconut oil |
7% |
(−) 10.2* |
Buffalo |
[55] |
| Coconut oil Garlic powder |
8:4 (mg) |
(−) 18.9* |
Buffalo |
[55] |
| Coconut oil + Garlic powder |
7% + 100 g |
(−) 9.1* |
Buffalo |
[55] |
| Eucalyptus oil |
0.33-2 ml/L |
30.3-78.6% |
Sheep |
[57] |
| Eucalyptus oil |
0.33-1.66 ml/L |
4.47-61.0% |
Buffalo |
[58] |
| Eucalyptus meal leaf | 100 g/d | reduce | Cow | [56] |
* Values are significantly different (P < 0.05) from control group; +,- the values were increased or decreased from control group.