Surto de polioencefalomalacia por ingestão excessiva de enxofre na dieta em bezerros no Rio Grande do Sul
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Data
2010-08
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Resumo
An outbreak of polioencephalomalacia in cattle caused by ingestion of high sulphur diet, in
Rio Grande do Sul, Brazil is described. One group of 30 calves was kept in Italian ryegrass
(Lolium multiflorum) pasture and supplemented with concentrate and minerals. Six calves
died, necropsy was performed in two of them and liver samples (for lead determination) and
fragments of central nervous system were collected. Clinical and neurological examination
was performed in one calf and confirmed brain involvement. Sulphur content on dietary
components and water, ruminal hydrogen sulfide production in five calves of the same group
and PCR from formalin-fixed paraffin-embedded cerebral tissues to detect bovine herpesvirus
5 DNA was perfomed. The total sulphur intake was 0.38% dry matter and the values of ruminal
sulfide concentration ranged from 1,000 to 2,500ppm. Lead It was not detected in the liver
samples and PCR was negative for bovine herpesvirus 5. The brain lesions were characterized
by laminar neuronal necrosis. The clinical signs of cerebrocortical syndrome associated with
high ruminal sulfide values, elevated intake of dietary sulphur and histological lesions confirmed
that the excess of sulphur caused the polioencephalomacia in these calves.
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Necrose cerebrocortical, Diagnóstico, Sulfeto de hidrogênio, Cerebrocortical necrosis, Diagnostic, Ruminal hydrogen sulfide
Citação
CUNHA, Paulo H. J. da; BANDARRA, Paulo M.; DIAS, Marcelo M.; BORGES, Alexandre S.; DRIEMEIER, David. Surto de polioencefalomalacia por ingestão excessiva de enxofre na dieta em bezerros no Rio Grande do Sul. Pesquisa Veterinária Brasileira, Rio de Janeiro, v. 30, n. 8, p. 613-617, ago. 2010.