Avillous Chorioallantois.

Avillous Chorioallantois.
Most of the surface of the chorioallantois is avillous. The pluriparous mare, a 3/4 Cleveland Bay, had been bred to a purebred Cleveland Bay stallion. She delivered a live foal at 333 days. There was no twin. This was her fourth foal.

Norman S (2010)