World's first cloned horse delivered

Washington(ANI): In what could be called as another first in cloning, researchers at Texas AnM University College of Veterinary Medicine and Biomedical Sciences have successfully delivered a foal using oocytes from a live mare.

The delivery of the foal is the first such clone in the world and it highlights, the researchers' long tradition of leading science in equine reproduction, and has been a great experience for the owner of the new foal.

"I've always liked having three horses to ride. I called and emailed breeders to spread the word that I was looking. Everything I could turn up was too small, too young, too old, not quite sound, etc. I realized I didn't want just another horse to have another body in the barn, I wanted another Marc," said Kit Knotts, proud owner of Mouse, the cloned foal.

Knotts' efforts to find a horse that had the same qualities as her prized Lippizan stallion, Marc, (Pluto III Marcella) brought her to Dr. Katrin Hinrichs at Texas AnM University.

"My local veterinarian, Dr. Brad Newman, mentioned that Texas AnM was cloning, but it was when Dr. Adam Eichelberger joined Newman Equine that we began to pursue the possibilities," she said.

"We have worked on this clone for about two years," said Hinrichs.

"This is actually our first foal produced using oocytes, or egg cells, from live mares. We recovered the oocytes from our herd of research mares using the same method used to recover eggs from women for in vitro fertilization. We used the oocytes for the cloning process, which made it difficult as we had very few to work with at any one time. During the cloning process, we tested a new technique that has been reported in mice to decrease birthing problems. Mrs. Knotts has been very supportive of our efforts to clone her horse, and has even named the foal 'Mouse' in honor of the research that produced him," she added.

The process began with a biopsy of skin cells from Marc, the horse to be cloned.

Through the cloning process using oocytes recovered from a live mare, viable embryos were developed and sent to Hartman Equine Reproduction Center, an embryo transfer facility in North Texas which works closely with Hinrichs' lab, for transfer into surrogate mares.

Minnie, the mare carrying Mouse, stayed in North Texas for approximately 200 days, then was sent to her new home in Florida.

Minnie began to show signs of an early delivery, and was taken to the University of Florida College of Veterinary Medicine for observation and intervention.

That's where Mouse arrived and was cared for by a team of neonatal experts that helped make sure he would make it through this critical time.

"Having Minnie with us for several months prior to foaling has been great. The teamwork between Dr. Hinrichs and her colleagues at the University of Florida has been outstanding, frankly saving Mouse's life more than once before and after birth," added Knotts.

Hinrichs noted that while Mouse is truly an identical twin to the original horse, Marc, that there will be differences as the foal grows due to environmental influences.

"I have become really interested in the science involved. Dr. Hinrichs has been wonderful about keeping me up on what is going on in the lab and feeds my interest by explaining things in terms I can largely understand. I am very proud of the contributions our project has made to the body of knowledge about cloning, which benefits far more areas of equine reproduction than most realize," noted Knotts.