Australian Broadcasting Corporation: Pig effluent could be used to grow algae or seaweed that is fed back to pigs as part of a closed-loop system for intensive piggeries. Key points: Researchers prove pig poo can be used to help grow algae Algae can be fed back to pigs or help to produce methane to generate electricity Pig manure can also help reduce use of costly fertiliser Researchers at Murdoch University's Algae Research and Development Centre have proven they can grow some aquatic species on untreated pig waste, despite...