If an insufficient number of embryos (less than 4) attach to the uterine wall, the pregnancy won't be recognized, and the sow will return to heat by Day 21 post breeding. If the embryos successfully attach to the uterine wall, they will begin to form in their own placenta, as each piglet has their own placenta.
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Answer:
If an insufficient number of embryos (less than 4) attach to the uterine wall, the pregnancy won't be recognized, and the sow will return to heat by Day 21 post breeding. If the embryos successfully attach to the uterine wall, they will begin to form in their own placenta, as each piglet has their own placenta.