Since TVNZ's Sunday programme aired pictures of pigs in single sow stalls last month, Mrs McCallum-Jackson, from free-range pig farm Havoc, at Hunter, near Waimate, estimated she had received between 500 and 1000 emails and she was still trying to answer them.
"By the time I get through 30, I get another 50. There are so many people that like pigs," the businesswoman said.
There was even an inquiry from a delicatessen in Singapore, and a woman in Minnesota who came from an indoor pig-breeding area wanted to bring 50 people to visit.
Farm visits at Havoc, however, were not encouraged for biosecurity reasons.
Mrs McCallum-Jackson said the messages started as soon as the programme was aired, along with orders.
They have had to ration products to their customers and there is a waiting list of cafes and restaurants wanting to be clients.
It had gone "crazy" at their stall at the Otago Farmers Market, with regular customers turning up with torches early in the morning on the first Saturday after the Sunday programme aired.
Business at the Havoc Farm Factory Shop in Waimate has been steady.
Looking for more land has been on the agenda for a while.
They have 90 sows on 20ha.
Formerly a human resources consultant in Auckland, the only contact Mrs McCallum-Jackson had had with pigs was when she bought pork chops at the supermarket.
Then she met her future husband, Ian.
He had worked with pigs around the world and did not like the animals being housed indoors. He believed there must be a better way.
"We do believe our pigs should be allowed to express their natural behaviour. That is our bottom line," he said.
Mrs McCallum-Jackson recalled how, when they first started Havoc, there were people in the pork industry who said they would never make a go of it, that people would buy on price, not quality.
"Frankly, I beg to differ," she said.
