Bison Management 03
NPS Photo Archive
In 1943, the live distribution of bison was terminated due to concerns of brucellosis in the herd. Brucellosis testing first took place in 1945 when 85% of 60 animals tested were found to be reactors or suspect. Vaccination and testing continued through 1948. This program was terminated in 1949/50 due to lack of vaccination and testing of adjacent cattle and bison herds. Because of this decision, all corrals were removed.