Police are investigating the discovery of a hidden camera at a Waikato dairy farm.
Waikato Federated Farmers president Chris Lewis says the camera was found aimed at the area where the farmer places milking cups on the cows.
Lewis has warned other farmers to look out for hidden cameras or people wandering on their property illegally and acknowledged the infamous bobby calf investigation could lead to more situations like this.
He said the farmer is in regular contact with police and said it isn't fair for farmers going about their work legally.
"Any New Zealander would find this a big invasion of anyone's privacy, and it'd be frowned upon by most people."