TUBERCULOSIS 



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Fig. 4o. Buying Tuberculoui 



Tlic bounded area in the cent T of the diagram represents a herd that was 

 dispersed by auction sale. Dots signify tubercular animals and half black 

 circles healthy animals. The healthy animals in the herds into which the 

 dispersed animals vent are shown by circles. The crossed circles indicate 

 originally tubercular animals in these herds Note the number of herds that 

 were infected from the one herd 



of tuberculosis it is certain that this is of no importance, 

 and attention should be focused on the animals purchased 

 and the dairy products fed. The introduction of the dis- 

 ease in the latter manner is easily guarded against by re- 

 quiring that the by-products of creameries and cheese fac- 

 tories be properly heated before being returned to the farm. 

 The rapid introduction of the farm-separator has resulted 

 in the practical abolition of the whole milk creamery, and 

 this is solving the problem of the spread of tuberculosis by 

 mixed skim milk. The return to the farms of unheated 

 whey is certainly an important factor in the spread of tu- 

 berculosis and other milk-borne diseases of animals. New 

 York, Wisconsin, and some other States require the heating 

 of all creamery and cheese factory by-products before they 

 are returned to the farms. Both farmers and operators 



