A ship carrying 50,000 New Zealand sheep and 3000 cattle on a 11,000km trip is only required to have one veterinarian on board, the Ministry of Primary Industries says.
The massive shipment of live sheep to Mexico has prompted concerns about animal welfare and led Oppositions MPs to question whether New Zealand's policy of not exporting livestock for slaughter was being breached.
A Ministry of Primary Industries (MPI) spokesman said today that there were a range of checks and balances for live animal exports to ensure animal welfare standards were maintained.
"With any approvals of livestock for export, the welfare of the animals is the highest consideration," the spokesman said.
The ministry said the animals are being exported for breeding in Mexico, where there was huge demand for sheep and cattle following a recent drought.