The experiment was conducted in Stipa breviflora desert steppe in Siziwang Banner of Inner Mongolia from July to November in 2002. Six different stocking rates and non-grazed plot (control plot) (CK) were set up with sheep in order to study selective intake behavior in response to stocking rates. The main results were as follows:(1) The local sheep displayed a high selection rate to a limited number of plant species. (2) Sheep had a higher preference to Convolvulus ammannii than any other plant species in...