摘要
从天然牧地看 ,青藏大区具有高蛋白、高脂肪、高无氮浸出物、高灰分、高代谢能及低纤维 (即 5高 1低 )的特征 ;南方大区恰好相反 ,呈现为 5低 1高的特征 ;北方大区的各项营养成分含量居中。就人工牧地而言 ,粗蛋白含量亦为青藏大区较高 ,粗脂肪和粗灰分则以南方大区较高 ,而粗纤维、无氮浸出物和代谢能 3个大区相近。人工牧地与天然牧地比较 ,前者的粗蛋白、可消化蛋白、Ca和P的含量显著地高 ,营养比和粗脂肪明显地低 ,而 2类牧地的代谢能、粗纤维、无氮浸出物和粗灰分相近或略有差异。由此表明 ,人工牧地在营养价值方面优于天然牧地 ,原因主要在于其蛋白质含量较高、营养比较低。
As regards natural rangeland,the nutritive value of Qinghai-Tibet large region possessed the characteristic of high protein,high fat,high nitrogen-free extract,high ash,high metabolic energy and low fiber,5 high contents and 1 low content;and of the south large region were just opposite from the aforesaid character,5 low contents and 1 high content were showed.The contents of each nutritive composition in the north large region mediated between aforesaid 2 large region.As far as artificial rangeland was concerned,the contents of crude protein of Qinghai-Tibet large region were also high,while the contents of crude fat and crude ash of the south large region were higher;but of crude fiber,nitrogen-free extract and metabolic energy were similar for 3 large region.Compared artificial rangeland with natural rangeland,the contents of crude protein, digestible crude protein,Ca and P were a markedly high, nutritive ratio and crude fat were obviously low for the former;but metabolic energy,crude fiber,nitrogen-free extract,crude ash of 2 type rangelands were a close or made a little difference.These showed that, the superiority of artificial rangeland to natural rangeland in nutritive value was largely that the protein was high and nutritive ratio was small for the former.
出处
《中国草地》
CSCD
2003年第1期22-26,共5页
Grassland of China
基金
中国科学院"九五"重点项目 (0 3972 2 15 )资助