天山西部高山区夏季放牧草地4种重要牧草营养品质评价

发布时间：2018-03-04 09:25

本文选题：牧草　切入点：营养价值　出处：《草业学报》2017年08期 　论文类型：期刊论文

【摘要】：为综合评价天山西部高山区夏季放牧草地4种重要牧草的营养品质,本研究设定在具有代表性的天山西部沙尔套山高山区(2800~3400m)夏季牧场,对分布在该区域的重要优势种牧草线叶嵩草、细果苔草、西伯利亚羽衣草和高山地榆进行分析。通过对其营养价值、消化率的测定及体外产气模型参数的估计。结果表明,各牧草在粗纤维和粗脂肪含量上均无显著差异(P0.05)。细果苔草的中性洗涤纤维(P=0.048)和酸性洗涤纤维(P=0.005)含量均最高。西伯利亚羽衣草粗灰分(P=0.037)含量最高,延滞时间(P=0.005)较长。高山地榆粗蛋白(P0.0001)、钙(P=0.001)和磷(P=0.004)的含量均最高,且有机物消化率(P=0.003)、代谢能(P=0.001)、理论最大产气量(P=0.067)和产气速率(P=0.079)也最高。线叶嵩草仅干物质(P=0.001)含量最高。最后采用主成分分析法综合14项指标,评价出4种牧草的综合营养价值,按优劣排序为:高山地榆西伯利亚羽衣草线叶嵩草细果苔草。
[Abstract]:In order to evaluate the nutritional quality of four important forages in summer grazing grassland in the western Tianshan Mountains, this study was carried out in the typical summer pasture of Shaertuoshan Alpine area in the western Tianshan Mountains. The main dominant species in this area, Kobresia humilis, Carex spp., Eupatorium sibirica and Ulmus alpine, were analyzed. The nutrient value, digestibility and gas production model parameters were estimated. There was no significant difference in the content of crude fiber and crude fat among the forages. The contents of neutral detergent fiber (P0. 048) and acid detergent fiber (P0. 005) were the highest, while the content of crude ash (P0. 037) of Eupatorium sibirica was the highest. The content of crude protein (P0.0001), calcium (P0. 001) and P0. 004 (P0. 004) of Sanguisorba altissima were higher than that of P0. 005). The digestibility of organic matter was 0.003%, metabolic energy was 0.001%, theoretical maximum gas production was 0.067) and gas production rate was 0.079). The content of P0. 001) of Kobresia humilis was the highest. Finally, the comprehensive nutritional value of 4 kinds of forage was evaluated by using principal component analysis (PCA) to synthesize 14 indexes. According to the order of superiority and inferiority: Alpine Ulmus sibirica, Kobresia humilis, Kobresia villosa.
【作者单位】：石河子大学动物科技学院;新疆生产建设兵团第十师农业科学研究所;新疆生产建设兵团绿洲生态农业重点实验室;
【基金】：国家公益性(农业)行业专项(201303062)资助
【分类号】：S816.1

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