The Liaoning high-yield strain of cashmere goats, a special genetic source, are forbidden to spillover and famous for their high cashmere yield.
辽宁高产系绒山羊以产绒多而闻名，为我国禁止外流的遗传资源。
To mutate breeding with Penicillium chrysogenum in existing production in order to obtain stable high yield strain.
对现有生产中的产黄青霉进行育种突变，以获得稳定的高产菌株。
First a strain with high lysine content is crossed with one having good yield characteristic.
首先把一个赖氨酸含量高的品系与一个具有丰产特性的品系相杂交。
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