内蒙古细毛羊日食量及对典型草原牧草的选食性测定

家畜对牧草的选食系数及基季节变化是草场评价和放牧决策的基础，家的采食量是评估草平衡的基本参数，在内蒙古典型草原区，对内蒙古细毛羊日食量与牧草无穷生测定表明，其日采食胆整个生长季平均为２．０６ｋｇ干物质，其季节动态为春季低，夏季高，秋季居中，在所研究草场上选食羊草、扁蓿豆、双齿葱、木地肤和糙隐子草等，而避弃大针茅、寸草 和星毛委陵菜等，为合理放牧提供了依据。

Grazing Intake of Inner Mongolian Fine-wool Sheep and Their Preference for Grassland Forage Species

The amount of daily intake made and the degree of preference for various forage species shown by grazing livestock are two basic indices for evaluating the supply-demand equilibrium of pastures and making management decisions in the grazing scheme. These indices were determined for Inner Mongolian fine-wool sheep in a typical Inner Mongolian grassland area. It was shown that the daily intake for the type of sheep averaged 2.06 kg (dry matter) through the growing season of pastures, with the highest intake taking place in summer, the lowest in spring and a medium in autumn. The forage species of Leymus chinensis, Medicago ruthenica, Allium bidentatum, Kochia prostrata, Cleistogenes squarrosa, etc. were the most preferred by grazing sheep, while others such as Stipa grandis, Carex duriuscula and Potentilla acaulis were usually avoided.