 Officials in Iowa have detected avian flu in cattle on two more Sioux City, Iowa dairy farms. Successful farming reports that brings a total to eight in the last two weeks. The Iowa Department of Agriculture says one of the affected herds has about 500 cattle. The other is much smaller, just about 45 animals. Sioux City has the largest number of dairy cattle in the Iowa County with 40 licensed dairies, and that means approximately one-fifth