Abstract
A 4-months-old calf of Japanese black cattle was diagnosed with orotic aciduria by gas-chromatography/mass-spectrometry (GC/MS). Until now orotic aciduria had not been reported in Japanese black cattle. The animal showed repeated diarrhea. The hematocrit was low, and microcytes and acanthocytes were observed in blood smears. The calf had lower serum total protein concentrations with a higher blood ammonia concentration. Needle-shaped crystals of orotic acid were observed in urinary sediments. Sequence homologous analysis with cattle uridine monophosphate synthase DNA indicated silent mutation in the affected calf.
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