The Ministry of Primary Investigations launched a probe and, after Bennett was sentenced in court, its investigations manager Simon Anderson said such abuse was unacceptable.
"There is never an excuse for ill-treatment of animals. [The ministry] takes any reports of abuse very seriously. If we find evidence that warrants charges being laid, we will prosecute," Anderson said.
Bennett was convicted, disqualified from working in the dairy industry for a year and ordered to do 125 hours' community work.