Bovine parafilariasis at the Cato Ridge abattoir: Sex prevalence and districts of origin.

Records indicate that Parafilaria bovicola-infested cattle slaughtered at the Cato Ridge abattoir originate from certain areas not previously recorded. Furthermore, moderate to severe infestations are diagnosed significantly more frequently in the entire male bovine than in female animals or oxen (castrated males). The data under review cover the period March 1981-August 1982, a period of 18 months.