Methane is a powerful greenhouse gas and ruminant farm animals belch out a huge amount of the stuff. No wonder people are scouring agrobiodiversity for animal feeds that minimise emissions. A paper in Animal Feed Science and Technology ((C.R. Soliva, A.B. Zeleke, C. Clement, H.D. Hess, V. Fievez and M. Kreuzer. In vitro screening of various tropical foliages, seeds, fruits and medicinal plants for low methane and high ammonia generating potentials in the rumen. Animal Feed Science and Technology. Corrected Proof, Available online 18 October 2007. http://dx.doi.org/10.1016/j.anifeedsci.2007.09.009)) has come up trumps. The researchers found differences in methane production not just among tropical feed species, but also among accessions of Acacia angustissima and Sesbania sesban. Something to add to the list of evaluation descriptors.
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