Horses, unlike humans, have an epitheliochorial placenta which prevents the transfer of antibodies to the foal in-utero.
2.
A common process is especially suggested by observations in animals with an epitheliochorial placenta like pigs and camels : here, the epithelium is not breached and the mature placenta consists of extensive interdigitation of very long trophoblastic and uterine epithelial microvilli throughout pregnancy.
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