Danish News: Manure from pigs has polluted watercourses all over the country with heavy metals

https://www.dr.dk/nyheder/indland/svinegylle-har-forurenet-vandloeb-i-hele-landet-med-tungmetaller

Almost four out five (79 percent) watercourses are polluted with zinc, and almost half (48 percent) are polluted with copper.

Approximately 70 and 75 percent of the zinc and copper respectively, that is in our aquatic environments, is assumed to come from agricultural fertilisers (including manure). Especially manure from pigs has caused this, senior researcher John Jensen explains. Zink and copper have been increasingly fed to pigs to prevent diarrhoea and increase growth.