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

From: Development of feeding systems and strategies of supplementation to enhance rumen fermentation and ruminant production in the tropics

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]
  1. * Values are significantly different (P < 0.05) from control group; +,- the values were increased or decreased from control group.