I must meticulously select the breeding stock.

我必须细致地挑选这些种畜。

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Technicians carefully picked strong horses and used them as breeding stock.

技术员精心挑选出强壮的马匹做原种.

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The chicken farm is going to select some good roosters to raise as breeding stock.

鸡场将优选出来的公鸡当作种鸡饲养.

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So, how does a breeder find out the exact genotypes of his breeding stock?

那么, 繁育者怎么知道他用来繁殖的狗是哪种基因型 呢 ?

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