We can only control what we can measure. In the case of dairy farming, nitrogen utilisation requires a higher level of control to reduce environmental pollution and improve farm economics. Nitrogen metabolism in the ruminant animal is a complicated system and accurate evaluation of protein utilisation by dairy cows is limited by current methods. This dissertation assesses various methods of analysing ruminal crude protein degradation and introduces a new method of assessing protein value of forages i.e. the protein available to the ruminant for absorption at the duodenum. The following procedures are included: in situ incubation, Cornell Net Carbohydrate and Protein System, in vitro enzymatic degradation and the modified Hohenheim gas test. The third section of this dissertation applies these methods to a controlled experiment investigating the effect of wilting on the protein value, protein characteristics and amino acid profile of grass silage. Conclusively, the results of this...

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