In jailing Whitelock, Judge Stephen O'Driscoll said the offending was at the higher end of the scale because of the number of animals involved and the variety of ways in which the animals were mistreated. He also denounced the "sadistic behaviour" that Whitelock had shown towards the animals.
"You were engaged in a culture of cruelty on that farm. Whatever the pressure or stress you may have been under, there is no excuse or explanation for that conduct."
Earlier in proceedings, defence lawyer Richard Maze argued that Whitelock had been out of his depth as manager of the farm as a previous employer had advised Landcorp that he was not ready for the job of dairy manager at the farm, without being given a significant level of support.
Whitelock was not given that support, Mr Maze said, and that he sometimes working from 4am until midnight.
He "worked himself into an utter hole, he simply lost the ability to cope", Mr Maze said.
He claimed that lack of proper support showed a "degree of systematic failure by Landcorp". However, Judge O'Driscoll said the offending was no one else's fault but Whitelock's.
"Many people go to work and are under stress. I don't think your reaction could be placed in any way at the fault of Landcorp. Nor could it be said that lack of supervision caused or contributed to that conduct. You were placed in a position of trust and you abused that trust."
Judge O'Driscoll said the "use of staff to perpetuate violence to animals" and the "cruel and gratuitous violence undertaken on some of these animals" were aggravating factors.
Whitelock also pleaded guilty to the unlawful possession of a shotgun, a .243 and a .22 rifle, for which he had no licences, alongside .243 ammunition, which were found stashed in his children's bedroom, in Timaru.
He was also charged with trying to persuade a witness to give a false statement to investigators.
GRS pd