An Australian trial on the use of red seaweed to reduce methane emissions from livestock has delivered some positive results in the longest trial to date on cattle. The trial involved feeding the seaweed aspara gopsis to Wagyu cattle over 300 days, and it delivered a 28% reduction in the methane released from the livestock. Australian Agricultural Company managing director David Harris says  a reduction of almost 30% is still significant and helps us understand more about how to apply aspara gopsis. However some cattle refused to eat the seaweed in the trial. Other important outcomes from the trial included no changes to taste or marbling, and the ability to use aspara gopsis oil over a sustained period.