Perth-based start-up Rumin8 is working on a dietary supplement - synthetically replicated from red seaweed - which stops the creation of the gas.
The company recently announced that it had raised A$12m in a funding round led by Breakthrough Energy Ventures, which Bill Gates founded in 2015.
The investment firm is also backed by Amazon chief executive Jeff Bezos, and Chinese entrepreneur and Alibaba co-founder Jack Ma.
University studies have shown that feeding cows seaweed could significantly cut their methane emissions.
