Animal demandingfeed availability balance control series studies 5 herbage yield monthly change

Based on the grassland primary production data obtained from Xilinguole League and Hulunbier League, the paper introduced the calculation method for herbage yield monthly dynamic coefficient. Herbage production dynamic changing patterns in different types of grasslands and in different regions were compared. The changing patterns under different grazing pressures were also examined. It was showed that herbage yield monthly changing patterns were similar in different situations. In most cases, the highest herbage yield occurred in August. In considering the similarity of climatic features in different pastoral regions in northern China, it was recommended that the method of calculating herbage yield dynamic coefficient introduced in this paper could be applied to more widespread regions in northern China. Some coefficients deduced from this paper could even be directly adopted by other regions with similar climate feature.