The farmers had been maintaining a picket at the Portlaoise site.
A blockade at the Glanbia Grain Mill in Laois has been called off after a deal was struck.
Members of the Irish Farmers' Association were protesting outside the plant in Portlaoise, calling for an increase in the base price for grain.
Glanbia has agreed to raise the price for barley from €128 to €144 per tonne, and wheat from €135 to €153 per tonne - after negotiations with the IFA last week.
Vice chair of the National IFA Grain Committee, Emo's Kieran McEvoy, says while conditions have become tough for tillage farmers, this is a big boost for the sector:
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