第三组对所有双胞胎，三胞胎等多胞胎的妊娠情况进行了登记。

The third was a register of all pregnancies of twins, triplets or other multiple births.

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许多国家已经通过限制移植胚胎数目来减少多胞胎出生情况了。

Many countries have reduced multiple births by limiting the number of embryos that are transferred.

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猪是多胞胎，它们可能会相互拥挤或者有其他的一些问题，造成了这些缺陷。

In pigs where you have multiple births, you could have crowding or some other issue that creates the defect [later on].

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