中文摘要：

研究了天祝高寒草甸区5个燕麦品种和品系在抽穗期、乳熟期和成熟期秸秆、籽粒、叶片和全株中营养成分含量和热值的差异。结果显示,4617秸秆、籽粒和全株在成熟期的粗脂肪含量显著高于乳熟期和抽穗期;可溶性糖含量和热值在乳熟期显著高于抽穗期和成熟期。青永久12秸秆、叶片和全株中的粗蛋白含量在抽穗期显著高于乳熟期和成熟期。4632秸秆中的粗蛋白和磷含量在抽穗期显著高于乳熟期和成熟期。巴燕三号籽粒中的粗脂肪含量在乳熟期（4.95%）和成熟期（5.48%）均显著高于抽穗期（2.36%）,全株中的可溶性糖含量在乳熟期（26.80%）和成熟期（24.11%）均显著高于抽穗期（12.14%）。87-6-21秸秆中的可溶性糖含量和4632籽粒、全株中的热值在乳熟期均显著高于抽穗期和成熟期。综合结果表明,抽穗期4617和4632秸秆和籽粒中的粗蛋白含量高于其他3个品种,87-6-21籽粒、叶片和全株中的可溶性糖含量高于其他品种。乳熟期青永久12秸秆和叶片、巴燕三号籽粒和4632全株中的粗脂肪含量显著高于其他品种。成熟期巴燕三号秸秆和叶片、青永久12全株和籽粒中的粗纤维含量最高;4632秸秆、87-6-21籽粒、4617叶片和全株中的中性洗涤纤维高于其他品种,87-6-21秸秆和叶片、4632籽粒和4617全株中的酸性洗涤纤维含量高于其他几个品种。

英文摘要：

Nutrient content and caloric value of stems,seeds,leaves,and whole-plant of five species of excellent oats（Avena sativa） planted in an alpine meadow area of Tianzhu were studied at heading stage,milking stage and mature stage.EE contents in stems,seeds,and whole-plant of Avena sativa cv.No.4617 at maturity were significantly higher than at the milking,water-soluble sugar content and caloric value at the milking stage were significantly higher than at the heading stage and mature stage.CP（crude protein） contents in stems,leaves and whole-plant of A.sativa cv.Qingyongjiu No.12 at the heading stage were significantly higher than at the milking and mature stage.CP and P contents in stems of A.sativa cv.No.4632 at the heading stage were significantly higher than at the milking and mature stage.EE（ether extract） contents in seeds of A.sativa cv.Bayan No.3 at the milking（4.95%） and mature stage（5.48%） were significantly higher than at the heading stage（2.36%）.Whole-plant water-soluble sugar contents at the milking（26.80%） and mature stage（24.11%） were significantly higher than at the heading stage（12.14%）.water-soluble sugar content in stems of A.sativa cv.Qingyongjiu No.87-6-21 and caloric values in seeds and whole-plant of No.4632 at the milking stage were significantly higher than at the heading and mature stage.CP contents in stems and seeds of No.4617 and No.4632 at the heading stage were higher than in the other varieties,water-soluble sugar contents in seeds,leaves,and whole-plant of No.87-6-21 at the heading stage were higher than in the other three varieties.EE contents in stems and leaves of Qingyongjiu No.12,seeds of Bayan No.3 and whole-plant of No.4632 at the milking stage were higher than in the other varieties.CF contents in leaves,and stems of Bayan No.3,seeds and whole-plant of Qingyongjiu No.12 at the mature stage were the highest;NDF（neutral detergent fiber） contents in stems of No.4632,seeds of Qingyongjiu No.87-6-21,leaves,and whole-plant of No.4617 were highe