"This morning Murray's eternal optimism has been sorely tested. So to you our friends ... we are asking you to PLEASE let us or the police know if you have seen or heard of a truck laden with our calf meal and powder; or have heard of any going cheap.
"[It's] just gutting for us as local producers and a proud, community minded family, that at least two people have entered our property, yet again and stolen from us and made our lives even tougher," she wrote.
The Gibbins believe the thieves backed their truck into the factory area where the feed was stored and loaded the three tonnes of feed by hand.
Murray told the Herald they had had two gas bottles nicked a few months ago but nothing this extreme.
He had no idea who the culprits were but said there were only two possibilities.
"It's someone who's either using it for their own calves, or someone who knows someone who would want to buy it."
The theft had left them in a difficult position but they were lucky to have some food still left in the silo, he said.
He was considering offering a reward to find the culprits. Meanwhile anyone with information should call the local police on 105, he said.
The stolen powder was the Bay Blenders brand while the meal was Reliance Calf Grower 20 per cent pellets.