36 



and all animals reacting are isolated in a separate building 

 all showing clinical symptoms are killed the others are 

 bred from, and their calves as soon as born, are removed before 

 they suck the diseased mothers or are licked by them. The 

 calves are placed in uninfected buildings and fed either on 

 milk from tested cows or sterilized milk and not exposed in 

 any way to direct or immediate contagion. It has been found 

 that with few exceptions they grow up healthy. They are, 

 however, tested twice a year and the reacting ones are re- 

 moved. The cows are killed off as they show clinical 

 symptoms or become fat. 



I stated that while I was a firm believer in his method, I 

 found practical obstacles from the fact that farmers have often 

 not sufficient means of isolation. He said that as our build- 

 ings in Canada were built mostly of wood, they could be 

 divided by close board partitions. He used them in Denmark. 

 In some he even had doors in them, but there was a risk in 

 that, and it was better to have separate buildings if possible. 

 He had encountered the same difficulty that I mentioned. 



Tuberculin testing is not compulsory but government supply 

 tuberculin and furnish inspectors for the testing free of charge. 

 Professor Bang makes all the tuberculin used in Denmark in 

 his laboratory and it is supplied free to any applying for it. 



The government kill all cattle showing clinical symptoms, 

 but do not prevent the farmers from disposing of reacting 

 cattle which show no observable symptoms, and butter is per- 

 mitted to be made from their milk. 



Many pasteurize the cream without lessening the quality or 

 saleableness of the butter. 



Cows with diseased udders are infective and dangerous, so 

 are those with nasal, uterine or intestinal discharges. 



Pleuritic or mesenteric tuberculosis may not be dangerous. 



Symptoms of diseased udder. He explained that the sym- 

 ptoms were first hard swellings, especially in the posterior 

 part of the quarter ; at first there was no change in the milk, 

 except perhaps a few flakes, yet, if examined the bacillus 

 would be found, and the milk would be thin and watery. 



