Of 189 grazing cattle on an artificially constructed grassland, 28 cattle with petechiae on the visible mucous membrane and two without hemorrhagic changes were selected for examination of physical properties and coagulation of blood. On this glassland, a cow was anticipated to have ingested such amount of bracken as corresponding to 0.025%of body weight during June when bracken throve.
The petechiae shown in the 28 cattle closely resembled those of spontaneous and experimental bracken poisoning previously reported in character. These cattle, however, presented clinical symptoms and the results of tests of physical properties and coagulation of blood which were completely different from those reported in the conventional case of bracken poisoning. In them, there was no statistical correlation between the change of blood and the intensity of hemorrhage. Therefore, it was difficult to conclude that the ingestion of bracken played a main role in the etiology of petechiae on the visible mucous membranein the cattle studied.

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The recovery rate of nitrate was 84.6% for natural cheese and 90.4% for process cheese. Nitrate detected was 1.2-16.8 and 1.2-12.5 ppm for natural and process cheese, respectively. It was 0.34, 0.40, 0.33, and 0.34 ppm for pasteurized, processed, andraw milk and specially prepared powdered milk, respectively.

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In the fall of 1974, Pseudomonas aeruginosa infection broke out among mink in Hokkaido, and 1, 883 mink died of it. Fatality rate was higher in 5-month-old animals than in adults. P. aeruginosa type 8 was isolated from organs of dead animals, feces of infected animals, sewage of the shed, and soil of the passage.
An inoculation program with a dose of 100-375 μg of OEP vaccine was performed over a period from 2 to 4 weeks after the beginning of the outbreak. As a result, fatality was reduced and antibody increased in titer in the indirect hemagglutination reaction. Therefore, this vaccine seemed to be effective, at least to some extent, against the spontaneous occurrence of this type of infection.

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As feed additives, three mixtures of sulfamonomethoxine and pyrimethamine (100 and 5 ppm; 50 and 2.5 ppm; and 10 and 2.5 ppm) were administered to 12 pigs weighing about 40 kg over a period beginning at 7 days before inoculation with Toxoplasma oocysts. As a result, a mixture of more than 100 ppm of sulfamonomethoxine and more than 5 ppm of pyrimethamine was presumed to be necessary for the prevention of a pig from toxoplasmosis.

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