After the accident, WorkSafe investigated the farm's safe systems of work.
The farm had implemented a procedure for safely moving sheep and lambs, which required workers to transport them in either a caged trailer or in cages on the back of a ute.
The side-by-side farm vehicle was not meant to be used to transport sheep and a sticker on the cargo tray reminded users not to carry passengers in the tray.
The coroner's report said WorkSafe had concluded there was no public interest in conducting a prosecution.
Andrew Hore played 83 tests for the All Blacks from 2002 to 2013, and was part of the squad that won the World Cup in 2011.