Bisoniana LXV. Morphology of the Spleen in the European Bison and Its Hybrids with Domestic Cattle

Morphological observations were made and linear measurements and weight taken on material consisting of 42 European bisons, ranging in age from 1 day to 24 years, and 32 hybrids between the European bisons and cattle, belonging to different generations and aging 5 months - 9 years. The spleen of the European bison is heavier than of domestic cattle and in adult specimens it reaches 1712.5 g or 0,26% of live weight (males) and 1505.0 g or 0,29% of live weight (females); it is also longer and broader (respectively, 64.53 and 63.73 cm long and 21.04 and 21.77 cm broad) than in cattle. Obserwacje morfologiczne oraz pomiary liniowe i wagowe wykonano na materiale obejmującym śledziony 42 żubrów (29, 13) w wieku od 1 dnia do 24 lat (Tabela 1) a także 32 mieszańców z bydłem domowym (17, 15) w wieku od 5 miesięcy do 9 lat (Tabela 2).