MPI district compliance manager Peter Hyde said today Ham had been found guilty on the substantive charge of "reckless ill-treatment".
The maximum penalty for an individual is up to three years in jail, and-or a fine of up to $75,000.
The lessor charge of failing to meet the physical health needs of 640 animals was dismissed.
Mr Hyde said the ministry was "pleased" with the judgment.
"It proves a serious reminder to farmers who sharemilk or lease their properties that they are still liable for what goes on at their farms and that they have an obligation as owners to ensure the farms are properly managed."
During the hearing in the Greymouth District Court, a veterinarian told of how he was haunted by the death of hundreds of cattle, saying it was the worst starvation he had seen in his 22-year career.
In total, 788 animals were found either dead or dying from starvation on the property, and many were so badly emaciated they had to be euthanised.