British farming unions are set to hold an "urgent summit" on milk prices after widespread protests over costs.
According to the National Farmers' Union, some farmers are being paid less than the cost of production, the state-run BBC reported.
The country’s supermarket chain, Morrisons, will meet farming unionists on Tuesday to discuss the price row.
The UK's four main farming unions: the NFU, NFU Cymru, NFU Scotland and the Ulster Farmers' Union are said to be taking part.
"The situation many of our members are experiencing has become a crisis," NFU chief Meurig Raymond was quoted as saying.
"In dairy, many milk producers have seen price cut after price cut. It's simply not sustainable for any farmer to continue to produce milk if they're selling it at a loss."
Protesters in the so-called "Milk Trolley Challenge" have been removing all cartons of milk from shops including Morrisons and Lidl before paying for it and taking it away or dumping it at the checkout, the report added.
Arla, Britain's biggest milk co-operative, previously announced a price cut of 0.8p per liter - taking the standard liter price to 23.01p for its UK members.
Meanwhile, British dairy organization AHDB Dairy said the average UK farm gate price was 24.06p per liter in May, a decrease of a quarter over 12 months.
Farmers estimate that it costs between 30 and 32 pence to produce each liter of milk.