..from its manure digesters, not from the cows. This works in America where cows are kept on concrete and fed hay. It is currently impractical to collect manur

..from its manure digesters, not from the cows. This works in America where cows are kept on concrete and fed hay. It is currently impractical to collect manure from fields in countries with more traditional farming methods, but i imagine some kind of field sized roomba could be developed?