S v 0 bod aM. and V 1 a s t a S v 0 bod 0 v Ii: Effect of Breed, Sex, Age, Management and Nutrition on the Incidence of Toxoplasma gondii Antibodies in Dogs and Cats. Acta vet. Brno, 56, 1987: 315-330.The incidence of Toxoplasma gondii antibodies was studied in 1002 dogs and 620 cats in relation to their breed, sex, age, management and nutrition during 3 years. Comparison of the group of serologically negative dogs with that showing T. gondii antibodi~s revealed no significant differences between them in relation to their breed, sex~ age and origin. In cats, on the other hand, significant differences were found depending on age / P<0.005/ and breed /P<0.05/ but effects of sex and origin were not observed.T. gondii antibodies were found significantly less frequently in animals kept exclusively in flats /dogs -P< 0.05; cats --P < 0.005/. They were also found signif icant1:y more frequently in cats that were in the habit of catching murine rodents /P< 0.01/ and other mammals and birds /P< 0.01/ and in dogs that were kept together with cats /P < 0.01/. The greatest differences in the prevalenpe of T. 90ndii antibodies were related to food composition and treatment. T. gondii antibodies were found"significantly /P<0.005/ less frequently in those dogs and cats that were fed exclusively heat-treated food. Where the animals were fed raw pork, beef and poultry meat, specific antibodies were detected significantly more frequently /dogs -P<0.05j cats -P