Table 9 Effects of plant secondary compounds and plant oil on digestibility and methane gas production in various studies

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]