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[Aphakia in a German Holstein calf].

U Schulze¹, H Kuiper, S Schmidtbauer

¹Institut für Tierzucht und Vererbungsforschung, Stiftung Tierärztliche Hochschule Hannover.

DTW. Deutsche Tierarztliche Wochenschrift

|October 3, 2006

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A German Holstein calf presented with severe eye malformations, including aphakia and glaucoma. Genetic factors are suspected due to the absence of other causes.

Area of Science:

Veterinary ophthalmology
Animal genetics

Background:

Congenital ocular malformations can significantly impact animal health and welfare.
Identifying the etiology of these conditions is crucial for breeding programs and disease prevention.

Observation:

A German Holstein calf exhibited bilateral ocular abnormalities, including aphakia (left eye) and microphthalmia, glaucoma, buphthalmos, and a luxated microphakic lens (right eye).
Pathohistological examination confirmed the lens abnormalities and hypoplastic uveoscleral tissue.
No other organ malformations or signs of Bovine Viral Diarrhea (BVD) infection were detected.

Findings:

Ocular malformations in the calf were not attributable to BVD infection or nutritional deficiencies (Vitamin A).
An inbreeding coefficient of 3.168% was calculated for the affected calf.

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Environmental factors were ruled out as the cause of the observed eye defects.

Implications:

The findings suggest a potential hereditary basis for the severe congenital ocular malformations in this German Holstein lineage.
Further investigation into genetic factors is warranted to inform breeding strategies and prevent recurrence.
Understanding the genetic underpinnings of such conditions can aid in improving bovine eye health.