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In page Mootral:

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The Mootral natural feed supplement is produced by Neem Biotech. The active ingredient is an organic organosulfur compound (normally found in garlic), Research at the University of Aberystwyth, Wales has demonstrated up to a 94% reduction in methane production. But that was in vitro test (rumen model) with high dosis. The same authors found only 15-25 % reduction in vivo when they tested on sheep.[citation needed]