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* There is a hige proportion of embryo loss in the first 3 weeks of gestation, as small embryos fail to secrete enough IFN-τ in this critical period.  Thus they do not block luteolysis.
 
* There is a hige proportion of embryo loss in the first 3 weeks of gestation, as small embryos fail to secrete enough IFN-τ in this critical period.  Thus they do not block luteolysis.
 
** This may be related to poor nutritional status of the mother.
 
** This may be related to poor nutritional status of the mother.
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== Sow ==
4,503

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