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Related Experiment Videos

Microphthalmia in Texel lambs.

W D Roe1, D M West, M T Walshe

  • 1Institute of Veterinary Animal and Biomedical Sciences, Massey University, Private Bag 11222, Palmerston North, New Zealand.

New Zealand Veterinary Journal
|July 21, 2005
PubMed
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Congenital microphthalmia, a developmental eye defect, was observed in Texel lambs in New Zealand. This condition, characterized by small eyes and optic nerves, is likely inherited as an autosomal recessive trait.

Area of Science:

  • Veterinary Ophthalmology
  • Animal Genetics
  • Developmental Biology

Background:

  • Congenital microphthalmia is a serious ocular defect affecting livestock.
  • Previous reports on this condition in Texel sheep are limited.

Purpose of the Study:

  • To document an outbreak of congenital microphthalmia in Texel lambs.
  • To investigate the pathological features and potential inheritance pattern of this condition.

Main Methods:

  • Ocular and optic nerve tissues from affected lambs were collected and fixed.
  • Histopathological examination using various staining techniques (H&E, Holme's silver, Luxol fast blue) was performed.
  • Macroscopic and microscopic abnormalities were analyzed.

Main Results:

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  • Affected lambs exhibited hypoplastic globes and optic nerves.
  • Histological analysis revealed dysplasia in the lens, ciliary body, iris, and retina.
  • Poor myelination of optic nerve axons was observed.

Conclusions:

  • Congenital microphthalmia is confirmed in Texel sheep in New Zealand.
  • The condition is likely inherited as an autosomal recessive trait, suggesting a genetic basis.