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"The process in effect "borrows"the bellys of various cows to carry to term embryos from a single cow of fine breed. a prime cow is given an ovulary stimulant, resulting in the production of several or even several dozen ova. " 胚胎移植實際上是一種"借腹懷胎"術(shù)。給一條良種母牛服一種催卵葯，結(jié)果産生出幾個迺至幾十個卵。