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* Fertility drops much faster either side of ovulation with frozen semen, especially in the sow.
 
* Fertility drops much faster either side of ovulation with frozen semen, especially in the sow.
 
** Hence, artificial insemination with frozen semen is rare in the sow.
 
** Hence, artificial insemination with frozen semen is rare in the sow.
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== Insemination Methods ==
 
== Insemination Methods ==
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