A Periodical Parasitological Survey of Calves on a Farm where ‘Sudden Death’ occurred

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  • ポックリ病が発生していた農場の子牛群における寄生虫調査
  • ポックリビョウ ガ ハッセイシテイタ ノウジョウ ノ コウシグン ニ オケル
  • A Periodical Parasitological Survey of Calves on a Farm where ^|^lsquo;Sudden Death^|^rsquo; occurred
  • A periodical parasitological survey of calves on a farm where ‘sudden death’ occured

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Abstract

From June to November 1986, a biweekly parasitological survey was carried out on calves on a farm, in Miyazaki Prefecture, where Sudden death due to an unknown cause has occurred since 1983. On June to December, a total of 20 newborn calves introduced to the farm at 4 different times (4 Groups) were examined by the modified McMaster technique. Strongyloides papillosus (SPL) eggs were detected in all calves (100%). The eggs in the feces appeared 2 weeks after calves were introduced to the farm and reared on sawdust litter. The highest EPG values, as much as about 10, 000, were noted in many calves from 4 to 6 weeks after the eggs appeared in the feces, and the eggs disappeared in the following autumn. Coccidial oocysts were detected 19 of 20 (95%), but the OPG values were below 5, 000. Trichuris eggs were also detecetd in some calves, and the maximum EPG was 800.<BR>Two calves with an extremely high SPL-EPG value died. One died suddeny, and the other died from emaciation. The season of heavy infection with SPL among the calves almost coincided with the season when the Sudden death occurred. This is the first report on a periodical parasitological survey of calves on a farm where Sudden death occurred.

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