Pancreatic duct carries pancreatic juice secreted by pancreas to the intestine for digestion of food.  Pancreatic juice contains various pancreatic enzymes like amylase for carbohydrate digestion , lipase for fat digestion, trpysin. If there is a blockage in the pancreatic duct, the juice won't reach the intestine. As a result protein and carbohydrate digestion can't take place without the enzymes. The food particles will remain undigested in the intestine. 
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