Most of the cows in New Zealand are used to create dairy products. Dairy is New Zealand's second highest export earner after Tourism.
Dairy cows have doubled in number since 1992. Unfortunately these cows produce 15 times more effluent than humans. This means that New Zealand’s environment has to process as much effluent as a country with 100 million people. Now only 38% of New Zealand’s waterways are ok to swim in. Check LAWA before you go swimming.