A study was conducted to identify herbs or herbal extracts having potent methane reducing capacity and determine their optimum level of inclusion in dairy cattle ration. The herbs collected for testing were Acacia concinna pods, Emblica officinalis seeds, Allium sativum bulbs, Zingiber officinale rhizomes, Ferula assafoetida resin, Psidium guajava leaves, Terminalia chebula seeds and Azadirachta indica seed kernels.Two in vitro gas production experiments were carried. The first one was to screen eight herbs, their respective water extracts, water residues, methanol extracts and methanol...