Seaweed has been quite extensively used as animal feed in at least Norway, to the point where some of the most known local species have names like kutare (cow k

Seaweed has been quite extensively used as animal feed in at least Norway, to the point where some of the most known local species have names like kutare (cow kelp), sauetang (sheep seaweed) and grisetang (pigs seaweed), since that's what you used to feed your cows, sheeps and pigs.