Table 1.

Effect of plant species or plant extracts containing secondary metabolites on enteric methane mitigation in ruminants as measured in open-circuit respiration chambers in tropical regions.

References	Scientific name	Family	Part of plant	Tannins	Saponins	Essential oils	Flavonoids	Methane mitigation (%) over control ration
Secondary compounds
(44)	Leucaena leucocephala	Fabaceae	Forage	+				20
(45)	Samanea saman	Fabaceae	Pods	+	+			50
(46)	Enterolobium cyclocarpum + Gliricidia sepium	Fabaceae	Pods + forage	+	+			6.3
(47)	Fagopyrum esculentum	Polygonaceae	Rutin				+	0
(48)	Leucaena leucocephala	Fabaceae	Forage	+				14
(49)	Termalia chebula	Combretaceae	Seed pulp	+				13
(49)	Allium sativum	Amaryllidaceae	Bulb	+				2.5
(50)	Mimosa caesalpiniaefolia	Fabaceae	Forage	+				31.2
(50)	Eucalyptus spp.	Myrtaceae	Oil			+		30