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This study aimed to evaluate the effects of twenty species of tropical macroalgae on  in vitro  fermentation parameters, total gas production (TGP) and methane (CH 4 ) production when incubated in rumen fluid from cattle fed a low quality roughage diet. Primary biochemical parameters of macroalgae were characterized and included proximate, elemental, and fatty acid (FAME) analysis. Macroalgae and the control, decorticated cottonseed meal (DCS), were incubated  in vitro  for 72 h, where gas production was continuously monitored. Post-fermentation parameters, including CH 4  production, pH, ammonia, apparent organic matter degradability (OMd), and volatile fatty acid (VFA) concentrations were measured. All species of macroalgae had lower TGP and CH 4  production than DCS.  Dictyota  and  Asparagopsis  had the strongest effects, inhibiting TGP by 53.2% and 61.8%, and CH 4  production by 92.2% and 98.9% after 72 h, respectively. Both species also resulted in the lowest total VFA concentration, and the highest molar concentration of propionate among all species analysed, indicating that anaerobic fermentation was affected. Overall, there were no strong relationships between TGP or CH 4  production and the >70 biochemical parameters analysed. However, zinc concentrations >0.10 g.kg −1  may potentially interact with other biochemical components to influence TGP and CH 4  production. The lack of relationship between the primary biochemistry of species and gas parameters suggests that significant decreases in TGP and CH 4  production are associated with secondary metabolites produced by effective macroalgae. The most effective species,  Asparagopsis , offers the most promising alternative for mitigation of enteric CH 4  emissions.

Effects of Marine and Freshwater Macroalgae on In Vitro Total Gas and Methane Production