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Albinism in a Suffolk sheep

M A Rowett1, M R Fleet

  • 1Jutland Park Suffolk Stud, Marrabel, South Australia.

The Journal of Heredity
|January 1, 1993
PubMed
Summary
This summary is machine-generated.

A new form of albinism in sheep, termed albino marrabel (cmar), is described. This autosomal recessive trait affects melanin synthesis and shows potential for the sheep industry due to its mild expression.

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Area of Science:

  • Animal Genetics
  • Mammalian Physiology
  • Biochemistry

Background:

  • True albinism in sheep is rare, with limited documentation.
  • Understanding genetic defects in melanin synthesis is crucial for animal breeding and industry applications.

Purpose of the Study:

  • To characterize a newly identified form of true albinism in sheep.
  • To investigate the genetic inheritance and biochemical basis of this albinism.
  • To assess its potential utility in the sheep industry.

Main Methods:

  • Pedigree analysis of affected sheep to determine inheritance patterns.
  • Histochemical analysis to identify defects in melanin synthesis pathways.
  • Enzyme assays to investigate tyrosinase activity.

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Main Results:

  • The albinism is inherited in an autosomal recessive pattern.
  • Histochemical tests revealed a defect in melanin synthesis, specifically blocking the conversion of tyrosine to dopa.
  • The enzyme tyrosinase, a product of the C locus, is implicated, suggesting a defective tyrosinase gene.

Conclusions:

  • A novel autosomal recessive albinism, provisionally named albino marrabel (cmar), has been identified in sheep.
  • The genetic defect involves a non-functional tyrosinase enzyme due to a mutation in the C locus.
  • This mild form of albinism has potential applications in the sheep industry.