HU, Xianfeng; Kliebenstein, James; PATTON, Sharon; … - Department of Economics, Iowa State University - 1997
Sera from hogs were analyzed using the modified direct agglutination test (MAT). Serum samples were collected from sows which were part of the National Animal Health Monitoring System (NAHMS) swine survey. The blood sera on file represented 394 randomly selected hog farms throughout the United...