in taxon has material basis in germline mutation in PKHD1 hereditary disease, non-human animal congenital liver fibrosis, PKHD1-related, horse https://github.com/monarch-initiative/mondo/issues/7271 A developmental disorder of the biliary system caused by a congenital defect in the remodeling of the ductal plate at the level of the interlobular ducts, resulting in persistence of excessive abnormal embryonic bile duct structures, irregular portal veins, and progressive fibrosis of the portal tracts that occurs in horses due to a mutation in the PKHD1 gene. MONDO:1012756 OMIA:001938-9796 congenital liver fibrosis, horse congenital hepatic fibrosis, horse liver disorder, non-human animal Equus caballus