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Corneal sensitivity in healthy bovine calves

Authors


Abstract

Objective

To evaluate corneal sensitivity as measured by the corneal touch threshold in healthy bovine calves.

Animals Studied

Twelve clinically normal male calves with predominantly Holstein genetics and a median age of 76.5 days (range, 67–92 days).

Procedures

Corneal touch threshold (CTT) of the central cornea was measured in both eyes of each calf using a Cochet-Bonnet aesthesiometer.

Results

The mean ± standard deviation corneal touch threshold of all eyes was 1.33 ± 1.1 g/mm2 (range, 0.62–66.15 g/mm2), corresponding to a filament length of 34.56 ± 8.02 mm (range, 14–47.5 mm). There was no significant difference between fellow eyes.

Conclusions

Cochet-Bonnet aesthesiometry was well tolerated in all 12 calves using a modified head restraint. Calves in this study may have a relatively sensitive central cornea compared to adult cattle and some other species; however, wide variation among individuals and eyes may be possible. Studies utilizing larger calf populations are necessary to establish reference ranges.

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