Bovine virus diarrhoea-mucosal disease was described for the first time in the USSR in 1967. The disease occurs in 20 to 80% of farms, depending on geographic and climatic zones of the country. Control measures against the disease include quarantine restrictions and prevention by means of specific preparations of active and passive effect. Passive prophylaxis is conducted by aerosol methods for...

Aim Spatial turnover of species, or beta diversity, varies in relation to geographical distance and environmental conditions, as well as spatial scale. We evaluated the explanatory power of distance, climate and topography on beta diversity of mammalian faunas of North America in relation to latitude. Location North America north of Mexico. Methods The study area was divided into 313 equal-area...