屠畜牛의 心臟筋肉내 住肉胞子蟲 感染失態와 sarcocystis cruzi 同定

A survey of sarcocystis infections in the slaughtered cattle and identification of sarcocystis cruzi

330 Samples of the slaughtered cattle heart muscle were collected from the abattoirs of five regions in Kwangwon-do to reveal the frequency of Sarcocysitis infections during January through Decemver in 1991. The samples were inspected for bradyzoites by the trysin digestion technique & the positive samples were fed to dogs & cats for the detection of sporocysts shed in the feces. The results obtained were summarized as follow. 1. The infection rate of bovine Sarcocystis investigated from 330 samples was 43.6%. 2. It revealed that the infection rate of Sarcocystis increased gradually with the advance in the age, 14.5% in below two years, 26.1% in three years, 30.0% in four years, 54.7% in five years, 74.4% in six years, 90.0% in seven years, 100% in older than eight years. 3. The cyst walls detected out from the heart muscles were less than 1㎛ in thickness and the size of bradyzoites were 11.8×2.8㎛ in average. 4. The size of sporocysts shed in the feces of dogs were 15.8×9.8㎛ in average and the prepatent periods ranged from 12 to 16 days. 5. Sarcocystis found in the bovine heart muscles were identified as Sarcocystis cruzi (Hasselman, 1923) Wenyon, 1926.