402 PRINCIPLES OF ANIMAL NUTRITION. 
In a second series of experiments a ration of 150 grams of meat 
and 100 grams of lard appeared to be equivalent to one of 300 grams 
of meat and 50 of lard. In a third series, fat, sugar, and gelatin 
were each given for two days to a fasting dog, the live weight * and 
urinary nitrogen being determined daily. The results were as 
follows: 
Date Live Weight, Kgs. Food. sheet 
Grms. 
Dee. 24.......... 25.780 Nothing 
Be DD siya cae a wis 25.125 ad 5.56 
QO Nocatee jeans 24.765 rf 6.05 
tO Dds wcll dupe 24.780+ .095 feces 200 grms. sugar 5.59 
OO 2B icassenes a 24.616+ .064 “ 200“ oe 4.13 
OO DO ox seas thes 24.215 Nothing 4,59 
PEABO! 3 eases la eset 23.920 200 grms. fat 6.56 
Se Bliicca gina 23.870+ .038 “ 200 “ ia 6.85 
Jans Ly vesas eas 23.500 Nothing 4.97 
AC Biscweeest 5 23.200 200 grms. gelatin 28.77 
Neglecting the variations in the urinary nitrogen, Contejean 
makes the following comparison of the daily loss of live weight, 
from which he draws the conclusion that 200 grams of sugar, 
equivalent to 792 Cals., was more efficient in maintaining the ani- 
mal than 200 grams of fat, equivalent to 1876 Cals. 
Gain or Loss of Live Weight per Day. 
Average for fasting......... ~—377 grams 
Sugar : 
First day.............. +110 grams 
Second day............ —100 “ 
Average ........... +5 * 
Fat: 
First day............06 —295 grams 
Second day............ —- 12 “ 
Average .......... —-154 “ 
* In taking the live weight any feces voided during the previous twenty- 
four hours were added to the weight of the animal, so that the computed gain 
or loss of weight does not include the feces. ° 
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