Results The detection rate of mass, yolk sac, embryonic bud, embryonic heartbeat and ovary was higher in the TVS or TAS TVS test than those in the TAS test (P<0.01).

结果TVS及TAS TVS对附件区包块、卵黄囊、胎芽、胎心搏动、宫内假孕囊、卵巢的检出率远较TAS高，差异均有统计学意义（P<0.01）。

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Clipping period has a clear impact on quality of alfalfa. in treatment T1, Crude protein content is the highest (showing bud period of Alfalfa)and NDF and ADF content are the lowest (P<0.05);

处理T1（紫花苜蓿现蕾期）的粗蛋白含量最高，中性洗涤纤维和酸性洗涤纤维含量最低（P<0.05）；

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