No I`m in a rural area, don`t think there are too many dairy farms in the cities. The Co. is northwestern rural electric co-op in Pa. it has mostly its own generating facilities & buys very little off market. Its part of a larger group of co-ops, has Raystown Lake Dam hydro-electric, part of an atomic plant & I forget what else. The poo generator is kind of all natural, it goes into enclosed pits & the enzymes work on it to emit the gas that in turn gives the fuel for the generator, when the pits are switched & cleaned the end result is a natural fertilizer. The only downside is that the farmer now makes more off the power than the farm but without the farm theres nothing to make the power. Its supposed to be the largest one in the U.S. so far but theres already more planned. Dried manure has been used for centuries most everywhere, this is a fresh manure that naturally creates methane. There are quite a few countries experimenting with this, this guy has a pretty size-able herd, it takes allot of crap.
No I don`t buy the dung, the electric co-op is partners with the farmer & buys the excess power for its grid.
No special diet that I know of, I`ve spent time in my neighbors barn & you got to be careful where your standing, must be a common thing with dairy cattle, tends to splash a bit.