[Virus-neutralizing antibodies in the colostrum and milk of brood sows vaccinated with an ethanol vaccine against Aujeszky's disease virus].

The experiment was carried out with five pregnant sows vaccinated with an etanol vaccine against the Aujeszky's disease virus. Studies was the level of virus-neutralizing antibodies in the blood, colostrum and milk serum of the sows as in the serum of their piglets. Virus-neutralizing antibodies were contained in high titers both in the blood, colostrum, and milk serum of the sows and in the serum of the offsprings. The titer of the passively acquired antibodies in the blood serum of the sucklings proved directly dependable on the titer of the colostral antibody level of their dams. The use is suggested of colostral sera for the evaluation of the immune status of sows in the breeding herds that are disease-free and vaccinated against the virus of Aujeszky's disease.