The incubation period in cattle is four to five years , said Dr. Stephen Sundlof of the Food and Drug Administration ( news - web sites ) .
The incubation period in cattle is four to five years , said Stephen Sundlof of the U.S. Food and Drug Administration .
Taupo was guiding her owner Paul Kibblewhite , 62 , on a three-day walk with a tramping party of eight .