Hydrops allantois condition is the abnormal enlargement of the allantoic sac, while hydrops amnii should be restricted to fetal dropsy and enlargement of the amniotic sac. Excessive amounts of the respective fluids are responsible for these conditions. Hydrops allantois is the most common condition, but occasionally a simultaneous hydrops allantois and hydrops amnii occur in the same animal. Hydrops occurs most often in bovine, both beef and airy, but hydrops amnii has been reported in the goat.
"A Case Report: Hydrops Allantois in the bovine,"
Iowa State University Veterinarian: Vol. 29
, Article 4.
Available at: https://lib.dr.iastate.edu/iowastate_veterinarian/vol29/iss1/4