EXPERIMENTAL DATA OF RAW AND BOILED MILK 181 



The average gain for the breast-fed puppies was 113-121 

 grammes per day ; for the boiled cows' milk puppy 48-2 grammes 

 per day ; for the boiled goats' milk puppy 457 grammes per 

 day ; and for the raw goats' milk puppy 38*4 grammes per day. 



In the second series four puppies were taken from birth. Two 

 were fed upon the breast, the third on raw, and the fourth on 

 boiled, cows' milk. 



Here again the breast-fed puppies did incomparably better 

 than the others. 



The experiment lasted seventy-five days, and during this time 



Puppy i on the breast had increased in weight from 165 to 



2864 grammes ; a gain of 2699 grammes. 

 Puppy 2 on the breast had increased in weight from 205 to 



2215 grammes ; a gain of 2010 grammes. 

 Puppy 3 on raw cows' milk increased in weight from 299 to 



1105 grammes ; a gain of 806 grammes. 

 Puppy 4 on boiled cows' milk increased in weight from 



238 to 1785 grammes ; a gain of 1547 grammes. 



Puppy 3 had the breast for six days and weighed 299 grammes 

 when the raw milk was started. The puppy fed upon raw cows' 

 milk showed what appeared to be evidence of rickets and was 

 chloroformed and examined post-mortem. No evidence of rickets 

 could, however, be found either macro- or microscopically. 



The coats of the breast-fed dogs were on the whole smoother 

 than those of the artificially fed dogs. 



Peer's ' Quotient of Increase ' 1 (which is represented by 



increase per kilo, of body-weight\ 



- - was worked outfor the artlficl - 



ally-fed dogs of this series, and was found to be 118 for the dog 

 fed upon raw cows' milk and 119 for the dog fed upon boiled 

 cows' milk. 



In both the series all the surviving animals developed into very 

 good dogs. 



It appears, therefore, that cows' milk can act as a substitute 

 for mother's milk in dogs, and that the dogs thrive better if the 

 milk is given boiled. 



The breast-fed dogs remained, however, greatly superior to the 

 artificially-fed ones. 



Moro (1907) showed that dogs fed upon human milk remained 

 alive but were in a very miserable condition, whereas dogs upon 

 cows' milk did extremely well. These results, taken in conjunction 

 with the results obtained by the same observer on rabbits, show 

 that in deducing results from experiments it is very important 

 to use a species of animal whose milk is suitable for the other species 



1 For details see Jahrb. f. Kinderh. 1902, Ivi. 421. 



