"They shook the cages to bother and scare the minks who are at the moment busy in the mating season and also harassed the farmer," said Peter Martinsson at Skåne police to the TT news agency.
The protest is reported to have been carried out by the animal rights group Djurrättsalliansen, an activist group that seeks the closure of the six remaining mink farms in the region.
The group have however flatly denied that they took part in the attack and the allegations of harassment by the farmer.
The attack comes shortly after a farmer in Skaraborg was threatened with an axe when he submitted an application to open a mink farm.
Djurrättsalliansen declared on its homepage that "the struggle to close Skåne's six remaining mink farms continues" and has a post celebrating the closure of a farm in Svedala.
The group argued that the "time for talk is over" and that the animals need treatment, calling for end to the fur industry in Sweden.
"The fur industry has had over 20 years to conform to animal protection legislation and study after study has shown that they haven't addressed the animals' serious behavioural problems," the group claimed.