An ailing 62-year-old man has successfully been given a kidney transplant from a genetically engineered pig in a first-of-its-kind procedure.

Surgeons at Massachusetts General Hospital in Boston carried out the milestone transplant last weekend, the New York Times reported.

The kidney started producing urine soon after the surgery, according to doctors.

The patient, Richard “Rick” Slayma, is already walking around and will likely be discharged from the hospital soon, they added.