活体采卵和屠宰场采卵的优质卵母细胞数和囊胚率差异显著。

There was significant difference on recovered high quality oocytes and blastocyst rate between from ovum pick-up and from slaughterhouse.

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现在让我们对美国也做同样的计算，减去从加拿大进口和从美国屠宰的全部猪的总数，然后除以美国种猪群体数。

Now lets do the same calculation for USA subtracting all pigs imported from Canada from USA slaughter total and then divide by U. s breeding herd.

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