方差组分估计所用的模型为奶牛育种中常用的公畜模型，它包括场年季固定效应、公牛组固定效应和公牛随机效应。
The model used was the sire model containing herd-year-season(HYS) effect(fixed), sire group effect(fixed)and sire effect(random), which is widely used in dairy cattle breeding.
得到的突变株遗传稳定性良好，克服了诱变随机筛选的不定向性和盲目性，提高了育种的工作效率。
The selected mutant has a good genetic stability. It overcomes uncertainty of random selection and the blindness, and increased the efficiency of strain breeding.
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