BAKER ON MILK OF TUBERCULOUS COWS. 



71 



Fnrtlior. tlio rnlvcs drojijjod by the infoctcd cows wero at onro romored, 

 IVd oil boiled milk, and later put with the iminlcclcd luM-d; and in 

 every instance the calves remained free from tuberculosis; thus i)roving 

 that those tuberculous cows did not ti-ansmit tuberculosis to their 

 ott'sjjrini;'. 



"Fifth lubvrciiliii test. Jn J<\'bi-uary, 18!)!), a liiial rouiid-up lest, of the 

 entire herd was a^ain made as the increase in i)ro<2:eny aj^ain necessitated 

 the sale of some of the stock. This test gave the same j^eneral results as 

 befor(\ thei'e bein<2, no inci-ease in the dis(^ase whatevei'. 



"In order to })resent the actual fi<;ures sliowin<'- the rate of herd 

 increase, the results of the different tuberculin tests are summarized 

 in the followinjn' table. These figures include the status of the herd at 

 th(^ different t«^sting ])eriods, but do not take into consideration the 

 young calves which were not raised. 



TABLE I. — Record of repeated iuheretilin tests made on a- herd in which the progeny 

 of reacting ani Dials iras separated from dams at birth. 



Date of test. 



January, 1896. . 



May, 1896 



April, 1897 



February, 1899 



No. of animals 

 adjudged by test as 



Healthy. 



18 

 21 

 30 

 64 



Affected. 



16 

 14 

 13 



7 



No. of animals in 



Healthy 

 section 

 reacting to 

 sub- 

 sequent 

 tests. 



Affected 

 section 

 not react- 

 ing to sub- 

 sequent 

 tests. 



* * * "The fact that since this experiment was begun, every calf 

 born in the herd has been free from tuberculosis is brought out forcibly'' 

 * * * by the diagram not here reproduced. '"In the majority of cases 

 where bull calves were dropped, they were disposed of as veal," * * * 

 "It is of course possible that these animals might have acquired tubercu- 

 losis later, but the fact that they w^ere born free from the disease, and 

 remained so for several months before the test was made, indicates 

 that it is i)ossible to raise a healthy calf from an affected mother in 

 the great majority of cases." * * '^* 



"The method here followed has come to be known as the Danish 

 method, because under the energetic leadership of Prof. Bang, the 

 government veterinarian, it has been thoroughly tried in Denmark. 

 Bang's numerous experiments indicate that the disease can be 'weeded 

 out' in a practical manner. At the present time the Danish law is such 

 that the government supplies the tuberculin and makes the test gratis, 

 provided the owner will separate his herd on the basis of the results of 

 the test. The sale of reacting animals is prohibited except for immediate 

 slaughter, which must be done under authorized veterinary control, the 



