Horses are regularly being illegally castrated by unqualified people on the East Coast of the North Island, an investigation has revealed.
The Ministry for Primary Industries said a culture of illegally castrating horses had become "well ingrained" amongst farmers in Hawke's Bay and the wider East Coast.
It found many unqualified people carrying out the procedure, not only for their own horses but as part of a business enterprise.
Compliance manager Mike Green said MPI was looking at prosecuting people who carried the illegal castrations.
"It appears to be a practice that is well ingrained in the culture of the farming and rural community of the wider East Coast area with this service being utilised by many large station owners despite them knowing it to be illegal.