03/05/2019 - Seaweed for feed? Yes. Seaweed has many potential uses as an additive in livestock feed, ranging from methane reduction to improved nutrient uptake and less need for antibiotics. Alongside differing in habitat, growth rate and pigmentation, the range of seaweed species also contain different compounds, varying their effectiveness as additives in feed. All of these factors must be taken into account before substantial action can be taken.