Debris from the Schooner Event, a Plowshare nuclear cratering experiment, was fed to a lactating cow and to a pregnant cow. Milk, urine, feces, and plasma levels of individual gamma-emitting radionuclides were followed for six days in these cows. In addition, the radionuclides in the maternal and fetal tissues of this pregnant cow were studied. Radionuclides of tungsten, iodine, tellurium, barium, and rhenium were observed in milk. Those of arsenic, ruthenium, iodine, tellurium, tungsten, and rhenium were observed in urine. Maternal and fetal tissues contained radionuclides of iodine, barium, and tungsten, while maternal tissues contained these and radioarsenic as well.