24 Bulletin 150. 



susceptible (including the human being) and that it is difficult 

 to keep all these and their products apart, and that further it is 

 not in our power to cut short the disease abruptl}' in the human 

 race as it is in the lower animals. There is however the counter- 

 balancing advantage that its propagation is slow and takes place 

 less readily through the air than in the case of most infectious 

 diseases. 



BREEDING HEALTHY STOCK FROM PARENTS WITH 



LATENT TUBERCULOSIS. 



Where the state is not pledged to exterminate the disease by 

 prompt and radical measures it is quite possible to raise healthy 

 stock from sires and dams that have tuberculosis in a slight and 

 latent form. It will be recalled that calves are usually born free 

 from tuberculosis. In the slaughterhouses of Europe there may 

 be but one tuberculous calf in 100,000 killed. If therefore the 

 calves can be preserved from infection of a parental source they 

 ma}^ be raised absolutely sound with very few exceptions. For 

 valuable pedigreed animals especially it is quite possible for the 

 owner to keep those with latent tuberculosis in secluded herds, 

 to remove the calf from its dam as soon as born, and to raise it 

 on the sterilized milk of the dam or on the milk of another and 

 healthy cow. 



In such a case it is always desirable to employ the tuberculin 

 test upon the entire herd, to destroy at once those animals that 

 have advanced or generalized tuberculosis, and to separate in a 

 new or disinfected barn under special attendants the cows that 

 have been attested sound. There will remain the slight and 

 latent cases which have reacted under the tuberculin, but which 

 are well nourished, having health}^ skins, e3"es and appetite, and 

 no cough, wheezing nor shortness of breath. These must be 

 kept well apart in separate barn and pasture where neither they 

 nor their products can come in contact with healthy stock, where 

 they can have good air and nourishing food. Their calves must 

 be kept in a separate building or park, and fed on the milk of 

 sound cows, or on that of their dams after it has been raised to 

 the boiling point for 15 minutes. After sterilization the milk 

 must be put in scalded vessels reserved for the use of the calves, 



