Abstract
A survey was carried out to investigate the occurrence of Sarcocystis infection in the loin ( Musculus longissimus) of Japanese and imported beef. In all, the muscle tissue of 482 samples were examined by histological method. The prevalence of Sarcocystis unspecified species cysts was lower in Japanese beef (total 6.31%: 0% in Holstein castrated, 12.96% in Holstein milk cow, 3.33% in Japanese shorthorn and 11.58% in Japanese black cattle) than in beef imported from America (36.78%) or Australia (29.49%). The infection density of imported beef, especially in American, was higher than in Japanese beef. All detected cysts except one were identified as Sarcocystis cruzi. One thick walled cyst was found in Australian beef but it could not be distinguished as either Sarcocystis hirsuta or Sarcocystis hominis.
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