High mountains pasture had a marginally higher degradability compared to forest steppe and steppe in Mongolia. Based on results of analysis of pastures taken all-year-round, we subjectively group the time into 4 periods, i.e. before April, May-June, July-September, After September. The time periods also corresponds to vegetative stage of pasture grass. The ranking in degradability and degradation rate of these periods is generally: May-June > July-September > Before April > After September. For very fruitful use of rumen degradable capacity of died standing forage of pasture there is a great need to provide nitrogen and mineral supply through supplementation feeding during the winter-spring.