That same year the ship had been used to export 4500 Holstein cattle on a 15-day voyage from Napier to China.
Now it has approval from the Ministry for Primary Industries (MPI) for up to 10,000 head.
Manager of animal health and exports, Carolyn Guy, previously said a comprehensive risk assessment had been done for the export, and MPI was satisfied the exporter had measures in place to mitigate animal welfare risks.
The vessel will depart only when MPI veterinarians are satisfied with the loading and welfare of the animals on board, and the Animal Welfare Export Certificate has been issued, she said.
Pettersson said it was "disconcerting" for them to see a ship with a "bad" animal safety record in dock.
"Someone has to stand up for these animals, someone has to speak for them."