Valuable breeding animals discovered to be tuberculous need not be sacrificed if they and their calves be handled according to the Bang method, or a modification of that method, of controlling tuberculosis and eradicating it from a herd. Of 23 calves born to the tuberculous cows of a quarantine herd on the Iowa State College farm, in the period from 1907 to 1915, inclusive, 18 passed the tuberculin test and proved to be free from tuberculosis; only 3 reacted to the test; 2 others were twins and were sold as veal at a few months of age. Among the 21 animals to be considered, the loss was 14.3 per cent.