There is an increased range of alternative forage available to Iranian dairy farmers. Improvements in breading, growing, harvesting and storage technology in this area have helped the expansion of alternative to whole crop cereals. Whole crop cereal silages are very flexible, allowing the decision to have the crop ensiled as fermented whole crop. Incubation of feeds in nylon bags in the rumen of fistulated ruminants have been used to evaluate the extent of digestion. The objective of the present study was the determine chemical composition, dry matter and crude protein degradability coefficients of whole barley, triticale and maize silages treated with urea.