呼伦贝尔草甸草原牧草青贮饲料脂肪酸成分研究

为测定呼伦贝尔草甸草原区40种主要野生牧草青贮饲料中脂肪酸成分及含量,对采集的牧草进行青贮处理45 d后开袋取样,采用气相色谱法开展脂肪酸成分的测定,主要研究结果如下:40种牧草青贮饲料样品主要由6种长链脂肪酸组成,均以棕榈酸和亚麻酸为主,亚油酸含量为0.1735%~40.2036%;粗脂肪和脂肪酸总量分别为1.3507%~10.8523%和0.0376%~3.2505%,其中,饱和脂肪酸总量为0.0252%~1.5333%,不饱和脂肪酸总量为0.0515%~1.7172%;粗脂肪与6种脂肪酸之间没有明显的相关性,而各脂肪酸之间存在着较为复杂的相关性。综合分析,40种牧草青贮饲料样品中,不同牧草间脂肪酸的构成比例差异较大,不同科别牧草的脂肪酸营养价值也有较大差异。

Fatty acid characteristics of forage silages from the Hulunbeir Meadow Steppe

To determine the types and amounts of fatty acids in silages produced from vegetation on the Hulunbeir Meadow Steppe,40 wild forages were ensiled and their fatty acids contents were analyzed by gas chromatography after 45 days.The main fatty acids in the 40 forage silages were six long-chain fatty acids,especially palmitic acid and linolenic acid.The linoleic acid contents ranged from 0.1735％ to 40.2036％.The ether extract and total fatty acids contents of the 40 silages ranged from 1.3507％ to 10.8523％ and from 0.0376％ to 3.2505％,respectively,and the saturated fatty acid and unsaturated fatty acid contents ranged from 0.0252％to 1.5333％ and from 0.0515％ to 1.7172％,respectively.There was no obvious correlation between ether extract contents and the contents of the six main fatty acids,while there were complex correlations among the different fatty acids.There were pronounced differences in fatty acids composition and proportions among the 40 different forages,and the nutritive values of fatty acids of forages also differed depending on the genera and families of the vegetation.