A SOUTH West feedlot has been broken into and vandalised early Tuesday morning.
The slogan, 'Stop live exports' was sprayed onto a shed at the facility, which is owned by Rural Exports and Trading, and a truck and trailer were set on fire.
Rural Exports and Trading general manager Mike Gordon said it was the third attack at the facility in 12 to 18 months.
"The graffiti is a nuisance, but destroying the truck belonging to a manure contractor destroys his livelihood and that is criminal," Mr Gordon said.
"We are tired of these activists being considered angels.
"They don't all have halos - there is a dark side."
Mr Gordon said in dryer conditions, the fire could have spread further putting livestock in the feedlot at risk.
"It could have been a very bad situation," Mr Gordon said.
"This is just senseless industrial espionage, and often they don't think through the consequences.
"They might think they are damaging the trade, but actually they are damaging people's livelihood."
This feedlot is not the only livestock facility to have been attacked in recent months.
Mr Gordon said other facilities in WA have also been vandalised and equipment damaged.
In June, $30,000 worth of damage was done to a tractor, and a livestock carrier had its tyres slashed.
Police, including a forensic team, are investigating and the company is reviewing its security measures.
Live export company Wellard alleges it has also had its own feedlot sabotaged on a number of occasions.
It said earlier this year activists placed the lives of the general public at severe risk, when they partially severed the brake lines and electrics between the prime mover and a grain trailer of two grain trucks that were due to deliver grain to the Fremantle wharf.
“The brake lines were only partially severed so we potentially could have had an 80 tonne truck and trailer moving through Fremantle on Easter Sunday with faulty brakes,” said Wellard Rural Exports CEO Fred Troncone.
“We were lucky we found the sabotaged lines when we did because they were cut in a position that was obviously designed to hide the damage from detection.
“People have a right to protest, but they don’t have a right to engage in criminal acts which puts lives at risk.”
Police are continuing to investigate that issue.
In other instances appliances have had their electrical cords cut, shearing machines and wool presses have been sabotaged, graffiti has been spray painted on buildings, a feed wagon has had its hydraulic lines cut and padlocks have been superglued.
“How can people claim they support animal welfare and then prevent our staff from feeding our sheep and monitoring their condition for any illness?” Mr Troncone said.
“That sabotage won’t stop live export, but it will mean that sheep will go hungry while we source parts to fix our machinery.”
Wellard increased its security after its trucks were sabotaged during Easter this year.
Any member of the public who might have any information related to these incidents is encouraged to contact CrimeStoppers.