Depending on the particular shipment, 25 to 90 percent of the feeder and stocker cattle coming into southern California desert feedlots get sick. Death losses and culling rates range from 6 to 8 percent among the lighter calves (250 to 400 pounds) and from ½ to 2½ percent for larger animals.

Members of the U. C. Stress Calf Study Group are Donald G. Addis; Glen P. Lofgreen, Professor of Animal Science, Imperial Valley Feed Station; Joseph G. Clark, D.V.M., Brawley; John R. Dunbar, Animal Scientist, U. C. Cooperative Extension, Davis; Carol L. Adams, Senior Statistician, U. C. Cooperative Extension, Riverside; Edward C. Prigge, Jr., Farm Advisor, Imperial County; and Ben B. Norman, Veterinarian, U. C. Cooperative Extension, Davis.