"There is a 20 pence per kilo difference in the producer price available locally and in Great Britain at the present time," added Pro Pork chairman Trevor Shields.
"I could understand farmers here in Northern Ireland having to accept up to three pence of a difference, given that our pigmeat has to cross the Irish Sea. This week the average pig price available locally is in the region of 110 pence per kilo whereas in GB farmers are getting 130 pence.
"This is an unacceptable situation and I can only conclude that processers are using pigs produced in Northern Ireland as a source of cheap pork and bacon."
Pro Pork is a producer group, marketing 3,000 pigs per week.
"There is absolutely no justification for this price differential," stressed the organisation's chairman.
"Pigs produced in Northern Ireland meet the exact same production and management standards as those expected of farmers in the rest of the UK. What's more, locally produced pork and bacon sells for exactly the same price in retail outlets throughout England, Scotland and Wales as does product emanating from farms in GB."
Trevor Shields went on to point out that one local processer will be increasing its price to retailers by 40 pence per kilo next Monday morning.
And he now believes that this strengthening market trend must be reflected in local producer prices with immediate effect.
"Some of our high health herds may be just about breaking even at the present time," he further explained.
"But for many local producers losses are still the order of the day. And this follows twelve months of extreme pressure on margins."
Trevor Shields concluded: "If pig prices do not improve in the very near future, many local producers will have no option but to call it a day.
"And if this happens, it will be a very sad day for agriculture in Northern Ireland.