日本のブロイラー産業におけるコクシジウム感染の調査- : 1973年春と夏の成績

概要

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Field surveys on coccidial infection in Japanese broilers were performed with187 fecal samples collected from 29 prefectures in March (spring season) and June (rainyor summer season) in 1973.Species identification was carried out by two methods; examination of oocysts morpholo-gy and chicken passage test. Based on the morphological characters of the oocyst type,genus Eimeria was classified into four types, acervulina, brunetti, maxima, and tenella.Oocysts were detected from 73% of the samples tested in March. Single and mixed infec-Lion with the acervulina type were found in 66% of all the samples tested, or in 90% of theinfected samples, and those with the tenella type in 28% or in 38%. The maxima typewas detected at a high rate. Similar results were obtained in the survey conducted in June.Neither seasonal nor regional difference was observed in the distribution of the oocysttypes. A high rate of infection and large OPG values were shown by chicken from 31 to70 days of age.It was confirmed that Eimeria acervulina and E. maxima could be identified from themorphology of oocysts. The chicken passage test was required to distinguish the oocystsof E. tenella, E. necatrix, and E. praecox from those of tenella type in the fecal samples.Those three species were distributed all over Japan without restriction.No E. brunetti was detected by either of the methods used.
社団法人日本獣医学会の論文
1974-08-25