Hyperimmune egg yolk semen extender was used for the inactivation of bovine
herpesvirus (BHV-1) in experimentally infected bovine semen. As much as 5
x 10(4) TCID50/ml of virus was inactivated in semen as assayed by tissue cu
lture. Moreover the hyperimmune egg yolk semen extender did not produce any
adverse effect on the quality of the semen after being frozen/thawed in co
mparison with normal egg yolk semen extender (P > 0.05). The hyperimmune eg
g yolk semen extender is considered an important tool for containing the sp
read of BHV-1 from infected semen.