To estimate prevalence of cattle persistently infected (PI) with bovine viral diarrhea virus (BVDV) at arrival at a feedlot, prevalence of chronically ill and dead PI cattle, and the magnitude of excess disease attributable to a PI animal.
Feedlot Research Group, Division of Agriculture, College of Agriculture, Nursing, and Natural Sciences, West Texas A&M University, Canyon, TX 79016, USA.