203 



organs and decreases the vitality of the animal, and eventu- 

 ally produces acute or chronic indigestion. 



(6). Faulty Breeding— hi-a,n(\.-m breeding or the mating 

 of closely related individuals is always to be regarded as 

 unsafe. It may bring out the weak or the bad points which 

 may predominate over those that were strong and good in 

 the sire and dam. Breeders who have developed distinct 

 breeds recognize the fact that continued in-and-in breeding 

 is very liable to produce an outcrop of tuberculosis. 



Early and frequent breeding produce a decrease in bodily 

 vigor and should be avoided. 



Intensive breeding, or the pairing of animals from two 

 great milking strains, may result in an offspring that is weak, 

 poorly developed and predisposed to tuberculosis. 



Animals with thin flat chests and long legs are predisposed 

 to tuberculosis by conformation and should not be used for 

 breeding purposes. 



Animals having tuberculosis should never he bred. 



(7). Disease, exposure to cold and rain and any influence 

 which depresses the vitality or physical vigor of an animal, 

 predisposes it to tuberculosis. 



It should not be understood that any or all of these pre- 

 disposing or preparing causes will produce tuberculosis 

 without the presence of the bacillus tuberculosis. Neither 

 should it be taken as self-evident that the absence of any or 

 all of these predisposing causes will always prevent the 

 spread of tuberculosis or the contraction of it. Dr. Niles 

 of Iowa reports the appearance of tuberculosis in a herd 

 that had been kept in the best out-door conditions. 



TUBERCULOSIS AMONG THE VAEIOUS SPECIES OF DOMESTIC ANI- 

 MALS AND IN MAN. 



There appears to be a constant relation between the 

 prevalence of this disease in man and in domestic animals. 

 In a state or locality where tuberculosis is very common in 

 the human family, it is also very frequently observed among 

 the more susceptible of domestic animals. Cattle and swine 



