New YorkK AGRICULTURAL EXPDRIMENT STATION. 5¢ 
In Period 1 with Cow 12 the amount of digested protein was 
large, about 2.6 Ibs. daily, and in Period 3 it was only 1.6 lbs. 
The decrease in ingested protein caused a marked decrease in 
urine nitrogen. In Period 1 the heat value of the urine was 
equal to 19.1 Cal. for each gram of nitrogen present, and in 
Period 3, 30.9 Cal. This simply means that the less the nitro- 
gen compounds present, the larger the relative quantity of other 
substances. We must conclude, then, that the loss of energy in 
urine cannot be calculated from any constant factor but must be 
determined in every particular case. 
HEAT ENERGY OF THE NUTRIENTS IN SEVERAL PERIODS. 
Calories in 
Calories in digestible 
digestible matter 
matter minus heat 
Total Cal- Total Cal- minus the value of 
oriesindry oriesindry MTotalCal- Caloriesin heat value urine and 
matter matter ories in digestible of the of methane 
Periods. consumed, of feces. urine. matter. urine. j lost. 
Cow 12. 
1st Period, 7 
Gaye. .u.. o9O0LT.9. 129879.6. 2.11623 .2 266138.3.. 254515.1 -224829.3 
2d Period, 7 
days-....-399765.8: 1360382.9 10881.2 2638642.9 252761.7 222024.4 
3d Period,8 
days .... 450326.2 162177.0 10584.0 _288149.2 277565.2 242683.3 
Cow 10. 
Feb. 4-10, 10 
Gave 44o0e0.6 £127231.8 .614525.1. .321352:3 ..306827.2'°273199:8 
We have now reached a point in the development of our data 
where we can see what they teach concerning the unit heat 
values of the nutrients utilized by these two animals. From 
the figures of the two preceding tables the unit values given in 
the succeeding table were calculated. 
HEAT VALUES BASED ON A UNIT OF ONE GRAM. 
Heat value 
digestible 
Heat value organic 
digestible matter less 
Heat value organic less heat 
Heat value Heatvalue Heat value digestible matter less values 
dry matter dry matter digestible organic heat value urine and 
of ration. feces. dry matter, matter. urine. methane, 
Cow 12. Cal. Cal. Cal, Cal. Cal. Cal, 
ist Period. 4.35 4.69 4.20 4.31 4.12 3.64 
2d Period.. 4.31 4.77 yo 4.23 4.05 3.56 
3d Period.. AAG 4.70 4.07 4.19 4.04 3.53 
Ad 4.38 4.54 4.32 4.49 4.29 3.82 
Average .... 4.383 4.67 4.17 4.30 4.12 3.64. 
