New research found pregnancies in mares and mules were strikingly similar, with comparable ultrasound findings. Despite their inability to reproduce naturally mules make amazing surrogate dams.
Source: The Horse, March 15, 2020. Link. “Mules can host the embryo of a mare, gestate normally, produce a good amount of milk, and have an incredible maternal instinct and ability,” said Eduardo L. Gastal, DVM, MS, PhD. “It’s curious for a hybrid that doesn’t usually have offspring to be such a good mother like this.”
It’s an amazing thing to see.” – Eduardo L. Gastal, DVM, MS, PhD