Dairy farmers have blockaded milk processing plants for the second night in a row over cuts in milk prices.
Campaign group Farmers for Action (FFA) blocked the entrances to a Robert Wiseman dairy in Droitwich Spa, Worcestershire, and another plant at Folston in Derbyshire overnight.
The group said that about 400 people and 20 tractors took part in the protest at the Folston site.
Dairy farmers are furious about cuts of up to 2p a litre in the amount they receive from major milk processors. Many fear the shortfall will force them out of business.
It is the latest in a series of protests by farmers who are angry that they are to be paid less for their milk than it costs to produce it.
On Thursday evening they used tractors to block a Robert Wiseman Dairy plant near Bridgwater in Somerset. Others gathered outside an Arla plant in Ashby-de-la-Zouch, Leicestershire, and another plant in Leeds.
Farmers welcomed a move on Friday by the Co-operative Group to increase the premium it pays to its farmers for their milk to 29p a litre.
But Peter Kendall, president of the National Farmers Union , said other retailers needed to follow suit.
"We are encouraged by the positive step taken by The Co-operative in ensuring that its farmers will be paid a fair price for their milk.
"But whilst this is an important move, all retailers must move to a sustainable funding model for the dairy industry."
West Mercia Police said the four-hour demonstration in Worcestershire involved about 200 protesters.
Inspector Paul Crumpton said: "Between 8pm and midnight an orderly protest took place at Wiseman's in Droitwich, where approximately 40 vehicles and 200 people gathered from the dairy farming community.
"Police were in attendance in small numbers and the crowds dispersed of their own volition at midnight. There were no further issues."