In North America, dairy farmers base the majority of their cow feed rations around corn (maize) silage. Corn is a popular North American crop and underlies a large proportion of their Agricultural economy. The main advantage of corn silage is its high starch levels as starch improves the energy content of the diet. High starch forages are seen as a desirable characteristic in North American dairy feed systems. When corn is not available, forages are made with cereal crops such as wheat and barley. In order to maximise starch levels in wheat or.