Adelaide University researchers have demonstrated that a naturally derived seaweed compound can dramatically reduce methane emissions from beef cattle raised in extensive grazing systems, without harming calves. The study, published in Frontiers in Animal Science, investigated the use of bromoform extract oil, derived from the red seaweed Asparagopsis, in pregnant and lactating Angus cows.
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I remember reading about this years ago. The farmers won’t use it because it’s an extra expense, despite how effective it is.