1-2 



that her own, while later a single tuberculous cow can infect many- 

 through mixed milk. 



Collected evidence has abundantly proved that by following the 

 simple rule, to feed calves only with cooked or highly pasteurized 

 milk gives the ver}^ best results. On farms where this method has- 

 been used all calves were healthy even where tuberculosis had widely 

 spread among the grown animals. 



The frequently mentioned Thurebylille experiment I shall now 

 describe more fully. This farm is rented by a company of Seeland 

 farmers who have attempted to raise a good class of milk cows of 

 the red Danish race. Losses from tuberculosis were suffered and 

 although these were not great, my assistance in the matter was 

 asked. In 1891 when the inoculation test with a part of the herd 

 had shown that the disease was quite widelv spread, I conceived the 

 idea of carrying out an experiment at this place. The object of this 

 was to ascertain whether it was possible in the manner often men- 

 tioned to gradually change a tuberculous herd into an eutirel}' healthy 

 one. This was to be done with the breeding material already at 

 hand, so as not to destroy what had already been accomplished, in 

 establishing a superior herd of cattle. The local relations were 

 unfavorable in that they did not permit the removal of the reacting 

 animals far from the healthy ones. It would be much easier of 

 course to guard healthy animals against contagion if they could be 

 placed in their own stable at a considerable distance from the others, 

 and if possible on an entirely separate farm. But it was my task to 

 prove that a successful result could be obtained under the unfavor- 

 able circumstances which exist on most farms. 



The stable at Thurebylille is a so-called square stable ; i. e. the 

 cows are placed in rows across the stable, the heads of every set of 

 two rows turned toward each other. Between such rows is a 

 fodder passage with two fodder troughs which, however, are not 

 used for water this being furnished in a trough kept full by a feed 

 pipe. The manure passages extend across the stable and the manure 

 is passed out through a series of doors in the walls. At the end of 

 the stable is connected a long calf-stable provided with a number of 

 laro-e and small boxes. 



