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Hydrops foetalis in sheep.

J W Plant1, S T Lomas, P A Harper

  • 1Department of Agricuture, Glenfield, New South Wales.

Australian Veterinary Journal
|October 1, 1987
PubMed
Summary
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A four-year study in sheep revealed hydrops foetalis, a severe fetal anemia causing massive swelling and death. The condition resembles human alpha-thalassemia, suggesting a potential genetic link in sheep.

Area of Science:

  • Veterinary Pathology
  • Reproductive Biology
  • Genetics

Background:

  • Hydrops foetalis, characterized by severe fetal anemia and generalized edema, poses significant challenges in livestock reproduction.
  • Previous outbreaks have been linked to various causes, but specific etiological agents are not always identified.

Purpose of the Study:

  • To investigate the clinical and pathological features of hydrops foetalis in a sheep flock.
  • To identify potential causes and compare findings to known genetic conditions in other species.

Main Methods:

  • Clinical observation of affected ewes and fetuses over four years.
  • Gross pathological examination of fetuses and placentas.
  • Microscopic examination of fetal tissues.
  • Exclusion of infectious and environmental factors.

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Main Results:

  • Affected fetuses exhibited severe generalized edema, ascites, hydrothorax, and placental edema, with birth weights up to 18 kg.
  • Microscopic findings revealed generalized extramedullary hematopoiesis and massive edema, indicative of chronic fetal anemia.
  • No infectious or environmental causes were identified for the outbreak.

Conclusions:

  • The observed hydrops foetalis in sheep shares striking clinical and pathological similarities with homozygous alpha-thalassemia in human infants.
  • These findings suggest a potential genetic basis for this condition in sheep, warranting further investigation into alpha-globin gene mutations.