162 MILK AND ITS HYGIENIC RELATIONS 



hibition strictly enforced. Under these circumstances the milk 

 of tuberculous cows is useless as a market commodity in its raw 

 state, and it becomes a matter of considerable financial importance 

 to the farmer to be informed what he can do in order to obtain 

 some return for the milk produced by tuberculous cows. 



The problem has been attacked practically in Denmark under 

 the direction of Professor Bang, of Copenhagen. Here the milk of 

 tuberculous cows is boiled and is then fed to their calves, with 

 results which are said to be entirely satisfactory. Unfortunately, 

 precise data upon this point are not available. 



Valuable work along this line has also been carried out by 

 Hittcher, whose work shows the value of an adequate and suitable 

 salt content in the food. He emphasises the importance of carrying 

 out experiments over a sufficiently long period, and also of taking 

 into consideration the age of the animal^ Growth is more rapid 

 in the early weeks than later, and much confusion may arise unless 

 this fact is recognised, especially when the amount of food taken 

 in relation to the body weight, and the increase in body weight, 

 have to be considered. The amount of food required in the feeding 

 of animals is a matter of extreme importance to the farmer, and 

 may just make the difference between financial loss and gain. 

 Hittcher's experiments show that, with the addition of salt, boiled 

 milk appears to be better utilised by the calves than raw milk. It 

 seems clear from the work in Denmark and from Hittcher's experi- 

 ments that calves may be fed quite satisfactorily upon the boiled 

 milk of their tuberculous mothers. 



CHAPTER IX 



ON THE NUTRITIVE VALUE OF BOILED MILK OF THE SAME 



SPECIES 



1. Human Milk. The experiments which have been made upon 

 the use of boiled human milk are not numerous. In this country 

 no experiments have been performed, and, as wet-nurses are not 

 used, little practical value attaches to the whole matter. 



The work hitherto undertaken in other countries has been 

 mainly carried out on individual children, which renders it difficult 

 to survey the investigations briefly. The results are somewhat 

 varied, partly, no doubt, owing to the different conditions under 

 which the experiments were conducted. The work, the greater 

 part of which was originally prepared by me for a report to the 

 L.G.B., is therefore necessarily given in considerable detail. 



Moro (1902) describes two cases of weakly children who received 

 first of all the breast, and were then fed upon the expressed milk, 

 which had been boiled for ten minutes. The children showed a 



