Fiber Performance of Introduced Huacaya Alpacas Grazing on Sown Pasture Principles for design of rotational grazing systems The effect of different grazing systems on soil nutrient contents in dessert steppe ENERGETIC ANALYSIS OF LAMB GRAZING SYSTEM IN SAINFOIN STUBBLE FIELDS Botanic Food Preference of Allactaga sibirica Forster and Its Relationship with the Vegetation Conditions of Their Habitat Effects of Different Grazing Systems for Dairy Cows on Soil Characteristics of Perennial Ryegrass/White Clover Sward Response of net primary productivity and C accumulation of plant communities in desert steppe and semiarid steppe with different land use types during two hydrologically contrasting growing seasons