西藏主要栽培牧草、作物秸秆营养价值评价

通过对西藏4种栽培牧草和6种作物秸秆的6种营养成分的测定,应用随意采食量、净能估测模型计算了栽培牧草和作物秸秆的分级指数,对其进行了综合评价。结果表明:品质较好的栽培牧草为隆孜紫花苜蓿Medicagosativa、黄花苜蓿M.falcata和江孜紫花苜蓿。作物秸秆品质较好的为土豆Solanumtu-berosum、玉米Zea mays和燕麦Avena sativa。同时运用灰色关联度分析法对其营养价值进行了综合评价,结果表明:栽培牧草营养价值高的为紫花苜蓿和隆孜黄花苜蓿;作物秸秆营养价值较高的有土豆和玉米。运用粗饲料分级指数和灰色关联度分析法对栽培牧草、作物秸秆营养价值的评定结果较为一致。

Evaluation of nutrition of main legumes forage and crop straws in Tibet

Six nutrition compositions of four legumes and six crop straws were assayed. Nutrition value was estimated synthetically by the grading index (GI) from dry matter intake（DMI）and net energy (NE). The results showed that the nutrition value of alfalfa (Medicago sativa), sickle alfalfa (M. falcata) in Longzi and alfalfa (Medicago sativa) in Jiangzi were the highest among the legumes, and the straws of potato (Solanum tuberosum), maize (Zea mays) and oat (Avena sativa) were the higher than other crop straws. Medicago sativa and M. falcata in Longzi in legumes and the three species as above in crop also were the most nutritional species using the method of GI and grey degree analysis method. The result from GI was consistent with that from grey correlation degree.