Roughage nutritional value evaluation indices and research methods

Roughage is the main source of nutrition for rumen microbes and their hosts. It is essential to effectively and scientifically evaluate roughage nutrition and feed value, to develop feed resources, to understand reasonable use of roughage, and to improve its utilization efficiency. This review of a large number of domestic and foreign studies details the evaluation indices and methods of evaluating the nutritional value of crude feed. It also discusses the development of evaluation methods and the advantages and disadvantages of each method. We can select the best evaluation index and method according to research needs, but this selection can play a role in the evaluation and rational utilization of the nutritional values of crude feed.