榆林沙区主要人工固沙灌丛营养成分及对放牧羊只生育影响的研究

人工固沙灌丛粗蛋白、粗脂肪平均含量比天然草地牧草分别高出16.22%、43.50%,钙的含量除紫穗槐外,平均高出27.37%.磷的含量低于天然牧草,氨基酸总量平均值为10.85%,略低于草地牧草,7种必须氨基酸含量与天然牧草接近,沙柳、紫穗槐的镁、锌含量高,踏郎铁含量高,铜的含量各灌丛均高.灌丛地放牧,杂交绵羊体重平均增加3.4%一32.0%,羊毛增加20.0%～79.3%,产羔率也有较大提高.

Effects of nutritive values of planted shrubs for sand-fixation on the reproduction of grazing sheep in Yulin deserted lands

Compared with forage plants in native grassland, average crude protein and crude fat contents in planted shrubs for sand-fixation were 16.22% and 43.50% higher, average calcium content was 27.37% higher except of Amorpha fruticosa, phosphorus content was lower. Seven essential amino acids contents were close to that of forage plants in native grassland. Magnesium and zinc contents were high in Salisc psammophila and Amorpha fruticosa, iron content was high in Artemisia sphaerocephala, and copper content was high in all shrubs tested. Grazed on the shrubs, average liveweight gain of crossbred sheep increased range from 3.4% to 32.0%, wool production increased range from 20.0K to 79.3% and reproduction rates increased significantly.