EXPERIMENTAL DATA OF RAW AND BOILED MILK 185 



Experiments on Goats. Briining (2, 3) carried out two sets 

 of experiments on goats, which are, however, really supplementary 

 the one to the other and can be taken together. Each litter had 

 consisted of three kids. These were fed as follows : 



First Litter- 

 Kid i. Breast-fed. 

 Kid 2. Boiled mother's milk. 

 Kid 3. Boiled cows' milk. 



Second Litter 



Kid 4. Breast-fed. 



Kid 5. Breast twice a day and other feeds raw cows* milk. 



Kid 6. Raw cows' milk. 



Kid i. Doubled its weight on the fifteenth day. The value 



for Peer's quotient was 50 '2. 

 Kid 4. Doubled its weight on the sixteenth day. The value 



for Peer's quotient was 53-1. 

 Kid 2. Doubled its weight on the twenty-second day. The 



value for Peer's quotient was 28-4. 

 Kid 5. Doubled its weight on the twenty-second day. The 



value for Peer's quotient was 25-0. 

 Kid 3. Doubled its weight on the twentieth day. The value 



for Peer's quotient was 24-0. 

 Kid 6. Doubled its weight on the twenty-fifth day. The 



value for Peer's quotient was 21-0. 



The initial weights of the animals were very different, so that 

 some of them had put on considerably more weight than the others. 

 Peer's quotient shows the nutritional value of the food, although 

 it does not show the caloric value of the food taken. 



These experiments bring out the great superiority of mother's 

 milk over that of cows' milk as a food for kids. They also show 

 slight superiority of boiled cows' milk over raw. 



Briickler (1907) carried out an experiment on goats on identical 

 lines to those of Briining. Two litters were used, and two goats, 

 for each method of feeding. The milk given was collected with 

 all possible precautions, and was as far as possible germ-free. 

 Briickler obtained a rather more rapid increase in weight with the 

 raw cows' milk than Briining did, but Peer's quotient was higher 

 with the boiled cows' milk than with the raw. 



Goats seem therefore to do fairly well on cows' milk, but 

 the results are very inferior to those obtained with mother's 

 milk. 



If cows' milk be given there is a slight advantage in giving it 

 boiled. 



Although experimentation upon animals in order to deter- 

 mine the nutritive properties of raw and boiled milk of foreign 



