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* For short term use:
 
* For short term use:
 
** Fresh liquid semen is used after seminal extension.
 
** Fresh liquid semen is used after seminal extension.
** In most species this can be cooled and stored at 5C
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** In most species this can be cooled and stored at 5◦C for several days-1 week.
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*** In swine 17-18◦C is optimal.
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* Widespread distribution and long-term use:
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** Frozen semen
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** Freezing and thawing compromises sperm viability in all species.
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* Fertility drops much faster either side of ovulation with frozen semen, especially in the sow.
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** Hence, artificial insemination with frozen semen is rare in the sow.
    
== Insemination Methods ==
 
== Insemination Methods ==
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