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Abnormalities of foetal fluids in sheep: two case reports
1Howard Florey Institute of Experimental Physiology and Medicine, University of Melbourne, Parkville, Victoria.
Australian Veterinary Journal
|October 1, 1993
Summary
Two sheep cases show abnormal fetal fluid accumulation. Early pregnancy amniotic fluid can form without a fetus, and hydrallantois may stem from altered allantoic membrane function.
Area of Science:
- Veterinary Medicine
- Reproductive Biology
- Sheep Reproduction
Background:
- Fetal fluid accumulation is crucial for pregnancy.
- Abnormalities can impact ovine reproductive outcomes.
Observation:
- Case 1: A ewe presented with two fluid-filled sacs lacking fetuses, containing fluid resembling fetal plasma.
- Case 2: A rare instance of hydrallantois in a ewe with significantly increased allantoic fluid volume and altered electrolyte concentrations.
Findings:
- Early-stage pregnancy (64 days) demonstrated amniotic fluid accumulation from resorbed conceptuses, independent of a viable fetus.
- Hydrallantois (100 days pregnancy) involved normal fetal and amniotic fluid but abnormal allantoic fluid composition, suggesting allantoic membrane dysfunction.
Implications:
- These findings expand understanding of early conceptus resorption and fetal membrane development in sheep.
- The cases highlight potential mechanisms for abnormal fluid accumulation, possibly linked to hormonal imbalances or membrane function alterations.