i8o MILK AND ITS HYGIENIC RELATIONS 



have been carried out upon dogs, and cows' milk seems to be a 

 suitable food for this species. 



Rodet (1896) took six puppies four of one litter (dogs 1-4) 

 aged from five to six weeks old, one of another litter of the same 

 age (dog 5), and another rather older (dog 6). 



Puppies i and 2 were fed upon raw cows' milk. 

 Puppies 3 and 4 were fed upon cows' milk, just boiled. 

 Puppy 5 was fed upon cows' milk subjected to prolonged 



boiling. 

 Puppy 6 was fed upon cows' milk just boilec}, as for puppies 



3 and 4. 



As regards weight, the balance was distinctly in favour of the 

 boiled cows' milk, the increase in weight at the end of thirty- 

 one days, when the experiment was terminated, being in the pro- 

 portion of 



638 for dogs i and 2, 

 796 for dogs 3 and 4, 

 276 for dog 5, 

 525 for dog 6. 



Dogs 5 and 6 were receiving rather less milk per kilo, of body- 

 weight than dogs 1-4. 



. , increase of weight . - . , . 



Taking the quotient -r-rr 7 -r 2 he found the value to be 



62 for dogs i and 2, 

 68 for dogs 3 and 4, 

 61 for dog 5, 

 62 for dog 6. 



Thus there was a better utilisation of the boiled cows' milk 

 than of the raw. 



Keller (1904) fed two young dogs upon sterilised and boiled 

 cows' milk respectively and found no difference between the two 

 dogs even after three months. 



Bnining (i) (1904) carried out two sets of experiments upon 

 dogs. 



In the first series he had six puppies (hounds), of which two 

 were left at the breast, one was fed upon raw cows' milk, and another 

 upon boiled ; the two remaining puppies received raw and boiled 

 goats' milk respectively. The puppy fed upon raw cows' milk 

 died on the fourth day of the experiment of inhalation pneumonia, 

 providing another example of the drawback of an insufficient 

 number of animals in an experimental series. 



The breast-fed puppies did incomparably better than any of the 

 others. Then came the one fed upon boiled cows' milk, and then 

 those fed upon boiJed and raw goats' milk respectively. 



