不同载畜率条件下绵羊选择性采食的研究

2002年7-11月,在内蒙古畜牧科学院四子王旗试验站,对短花针茅Stipa brevi flora荒漠草原不同载畜率条件下的蒙古细毛羊的选择性采食进行了观察研究.结果表明:绵羊对适口性好的牧草有很强的选择性采食能力,其食谱主要由几种适口性好的牧草组成;绵羊的选择性采食有明显的季节变化,8月对银灰旋花Convolvulus ammannii的嗜食性指数高于其他牧草,9月对栉叶蒿Artemisia pectinata的嗜食性指数有所增大;同一季绵羊食谱各放牧处理间无显著差异,但随着放牧时间的延续和气温的下降,食谱中的植物种类组成明显减少.

Comparison study on selective intake behavior of sheep at different stocking rates in stipa breviflora desert steppe

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 Aug, but the preference ratio to Artemisia pectinata frigid increased at the end of the experiment, especially with higher stocking rates. (4) The composition of diet showed no differences among the stocking rates in the same season, but the number of plant species available declined with the seasonal change.