Farmwatch had been gathering evidence since May last year and then passed fresh alleged evidence to MPI, asking it to undertake another investigation that resulted in the charges.
The animal advocate demanded MPI be stripped of its animal welfare responsibilities and an independent animal welfare ministry be set up instead. It also called on the government to strengthen the Search and Surveillance Act so that cameras can be placed in all dairy sheds and slaughterhouses.
The unidentified farm owner at Mangapai issued a statement through Dairy NZ, saying as life-long and committed dairy farmers they were shocked and deeply saddened by the video footage.
Luke had been removed from all duties requiring unsupervised contact with stock as soon as the video footage came to light.
He will re-appear for a callover in the Whangārei District Court on July 5.
The maximum penalty for the wilful ill-treatment of an animal is five years imprisonment or a fine not exceeding $100,000 for an individual, or both, and $500,000 for a body corporate.