Veterinary Embryology 8.5: What is the reason that the yolk sac and vitelline circulation persist longer in the horse than they do in most other species?

Question

What is the reason that the yolk sac and vitelline circulation persist longer in the horse than they do in most other species?

Magdalena Badenhorst · Accepted Answer

The presence of the choriovitelline placenta

What is the reason that the yolk sac and vitelline circulation persist longer in the horse than they do in most other species?