EXPERIMENTAL DATA OF RAW AND BOILED MILK 183 



left with their mother, but were only allowed to feed at stated 

 intervals, and were weighed before and after each feed, so that the 

 total quantity of milk taken was known. Pigs D and E were 

 fed upon boiled cows' milk, and pigs F and G upon raw cows' 

 milk. 



The initial weights of the pigs varied from 912-1365 grammes. 

 The supply of mother's milk was poor, and the breast-fed pigs 

 obtained a much smaller quantity of milk than the artificially fed 

 pigs. All ate well and put on weight well. 



No appreciable difference could be detected between the different 

 pigs D and E, and F and G, but the artificially fed pigs doubled 

 their weight rather sooner than the breast-fed ones, possibly owing 

 to the shortage of food supply in the latter case. 



Peer's quotient (increase per kilo, of body-weight -=- kilos, of 

 milk taken) gave a value of 165 for the breast-fed pigs, of 65 for 

 the pigs fed upon boiled cows' milk, and of 60 for those fed upon 

 raw cows' milk. 



Mother's milk is therefore very much better utilised by pigs 

 than cows' milk, and boiled cows' milk rather better than raw. 



Bamberg (1910), realising that in all the experiments which 

 had been carried out so far, ordinary impure market milk had been 

 used, undertook some experiments upon pigs in which he used the 

 purest milk obtainable in Berlin. The bacterial content of the 

 milk was taken and the milk was found to be almost germ-free 

 throughout the experiment. 



The milk was obtained from the Viktoria Park Dairy. 



A litter of eight pigs was taken immediately after birth. 



Of these pigs 



A and B were fed upon raw cows' milk from the 



Viktoria Park Dairy. 

 C and D were fed upon boiled "cows' milk from the 



Viktoria Park Dairy. 



E was fed upon raw cows' milk (market milk). 

 F was fed upon boiled cows' milk (market milk). 

 G and H were fed upon the breast. 



Pigs G and H doubled their weight on the I4th day. 



A B iyth day. 



Pig F doubled its weight on the igth day. 



C 20th day. 



D ,, 23rd day. 



E 32nd day. 



Pigs C and D did not seem quite so happy as A and B. 



As regards weight, therefore, the pigs fed upon raw germ-free 

 milk did rather better than those fed upon the same milk boiled. 

 But the pig fed upon boiled market milk did very considerably 

 better than the one fed upon raw market milk. 



