[neodypsis]

I assume must feces require prior treatment before they can be used as fertilizer.

[aitchnyu]

Cowdung was/is used untreated as manure in India, also as flooring and medicine. IIRC it was/is low in the list of health concerns.

[sollewitt]

Not really, it's just time before spreading and time for the soil bacteria to do their thing.