Spontaneous lesions detected in the beagles used in toxicity studies

Four hundred and twenty beagles 1 to 4 years of age were examined for spontaneous pathological changes. In the liver were seen fine granular gallstones (87.5%), granulomas (59.9%), intranuclear hyaline inclusions (52.6%), lipofuscin deposition (50%) and eosinophilic inclusions (3.7%) in the cytoplasm of hepatocytes and parenchymal necrosis at the base of the ligaments (7.3%). Intranuclear hyaline inclusions and lipofuscin deposition were more frequently seen in dogs after being subjected to tests for more than 13 weeks. Besides, hyperplasia of follicular epithelial cells of the thyroid gland (46.3%), Gandy-Gamna like bodies of the splenic capsule (43.1%), small cysts in the anterior lobe of the hypophysis (35.1%) and prostatitis (13,7%) were observed. Lesions due to migration of Toxocara canis larvae were detected in the liver, kidney, lung and other organs from 33.1% of cases examined.

Comparative studies on the gastric glycopeptide in eleven animal species

1. Glycopeptides in the stomachs of eleven mammalian species, including human, rabbit, horse, cow, pig, goat, sheep, dog, cat, guinea pig and rat were assayed by determining the carbohydrate content of materials which remained after proteolysis. 2. The glycopeptide content was higher in the mucosa than in the muscular layer including serosa, especially in the porcine stomach and the fourth stomachs of the ruminants than in the stomachs of any other animals. 3. The glycopeptide, which was stained with both alcian blue and PAS, was absent or sparingly present in the mucosae of the human, rabbit, horse stomachs and in the mucosae of the first to third stomachs of the cow, goat and sheep, whereas in the mucosae of the pig, dog, cat, guinea pig and rat stomachs and in the mucosae of the fourth stomachs of the cow, goat and sheep, it was found in noticeable extents.