The Visual Guide to
Ovine Reproduction
- Prolapsed Vagina
- Hydrops Allantois
- Mummification
- Maceration
- Ruptured Prepubic Tendon
- Abdominal Hernia
- Pregnancy Ketosis
- Prolonged Gestation
- Uterine Torsion
Accidents of Gestation: Hydrops Allantois
Hydrops Allantois.
This ewe is down in sternal recumbency due to the excessive weight of allantoic fluid, a result of hydrallantois. The etiology of hydrops allantois is adventitious placentation. This condition is typically seen during the last third of gestation and may lead to severe respiratory distress due to pressure on the diaphragm.
Utrecht (1976)
Hydrallantois at Necropsy.
Tight, hugely distended uterus with flattened placentomes, was due to excessive allantoic fluid during the third trimester of pregnancy in a ewe.
Smith MC (2010)
Clear Allantoic Fluid.
Clear allantoic fluid (35 liters) from the uterus of a Finn x Dorset ewe with hydroallantois. Triplet fetuses weighed a combined total of 11 Kg.
Smith MC (2010)
Drainage of a Hydrallantois.
The excessive allantoic fluid may be tapped with a trocar. The fluid is clear, watery, yellowish and odorless. New allantoic fluid is formed within several days and the abdominal distension returns.
Utrecht (1976)
Grossly Distended Uterus.
Hydrops allantois in a ewe that weighed 82 kg, which included 8.2 kg for triplet lambs, and 31 kg for allantoic fluid that ran out of the uterus. The grossly distended uterine wall has become transparent and shows several placentomes and their vasculature.
Smith MC (2006)
Necropsy View.
Hydrops allantois in a ewe that weighed 82 kg, which included 8.2 kg for triplet lambs, and 31 kg for allantoic fluid that ran out of the uterus. The flaccid empty uterus is draped over the body wall to the left. Clear amber-colored allantoic fluid has flooded the area.
Smith MC (2006)