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Hypochondroplastic dwarfism in the Irish setter

I Hanssen1, G Falck, A T Grammeltvedt

  • 1Strinda Small Animal Clinic, Trondheim, Norway.

The Journal of Small Animal Practice
|March 12, 1998
PubMed
Summary
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Dwarfism in Irish setters is caused by a single autosomal recessive gene. This condition, characterized by retarded bone growth, can be diagnosed using a new morphometric method.

Area of Science:

  • Veterinary Genetics
  • Canine Pathology
  • Animal Morphology

Background:

  • Dwarfism presents a significant challenge in purebred dogs, impacting skeletal development.
  • Understanding the genetic basis and clinical manifestations of dwarfism is crucial for breed health management.

Purpose of the Study:

  • To investigate the genetic, clinical, and pathological features of dwarfism in Irish setters.
  • To develop a diagnostic method for identifying dwarfism in the breed.

Main Methods:

  • Conducted test matings in Irish setters to study inheritance patterns.
  • Performed comprehensive evaluations including genetic, clinical, morphometric, radiographic, histological, and biochemical analyses.
  • Developed a morphometric diagnostic approach for canine dwarfism.

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Main Results:

  • Offspring exhibited normal phenotype at birth and weaning, with growth retardation observed between 2.5 to 4 months.
  • Radiographic and histological findings indicated hypochondroplasia in affected individuals.
  • A single autosomal recessive mode of inheritance was confirmed for Irish setter dwarfism.

Conclusions:

  • Irish setter dwarfism is a genetically determined condition with a clear autosomal recessive inheritance.
  • A novel morphometric method aids in the diagnosis of this skeletal dysplasia.
  • Affected dogs can maintain good performance despite the condition.