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animal
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By abdominal breed
从一个动物体内取出受精卵,移植到另一动物体内,并在那里发育成胎儿,这种繁殖方法叫
借腹怀胎
。如从一头良种奶牛体内取出受精卵,移植到普通奶牛体内,从这头普通奶牛体内产出良种奶牛,用这种方法可以使良种奶牛由原来一年怀孕1~2次增加到许多次,大大加快了繁殖的速度。