Dairy farmer says he saves money by converting cow manure to electricity . Remaining waste from 600 cows is used as fertilizer and mulch . Score: 6 It used to stink a lot . '' He says process also helps cut dairy farm 's odor .
Dairy farmer says he saves money by converting cow manure to electricity . Remaining waste from 600 cows is used as fertilizer and mulch . Score: 6 He says process also helps cut dairy farm 's odor .