New YorK AGRICULTURAL EXPERIMENT STATION. 59 
If no allowance is made for the energy loss in methane the 
Rubner unit values are not greatly larger than the average of 
these determinations. If, however, the loss from the escape of 
hydrocarbons is as large as that observed by Kellner and others 
then the available energy of the digestible organic matter was 
3.64 Cal. per gram. Kellner found it to be 3.5 Cal. for the 
digestible organic matter of meadow hay, and Armsby, in deter- 
minations with steers, using timothy hay, found it to be 3.62 
Cal. 
THE DISTRIBUTION OF THE ENERGY OF A RATION. 
It is interesting and instructive to note the distribution of the 
energy of aration. It may be classified, first as available and 
non-available. The available energy is applied to the various 
uses of the animal and in the case of the milch cow is distri- 
buted among the milk solids, the work of milk production and 
maintenance needs. 
These energy relations are best expressed in terms of per- 
-centages without repeating any previous figures. 
DISTRIBUTION OF TOTAL ENERGY OF RATION, 
Cow 12. Cow 10. 
Per: lo Perse. Per: 3. 
Per ct. Per ct. Per ct. Fer ct. 
Methane ( Available IGEN we aelcle Savsicats oe 61 Oesa) 1 oe 61.6 68.4 
not con- <: ot) Urine: Se 229 wet 2.4 3.2 
sidered. ¢ Nou-available energy.¢ proces | 32°8 84.0 36.0 28.4 
Assumed { Available energy .............. 56.8 5Ow5 53.9 60.9 
methane Uritien. ise. 9 ok 2.4 Oba 
energy | Non-available energy. < Methane. 7.5 TE tek Loc 
deducted. [ Beces’ +0258 34.0 36.0 28.4 
DISTRIBUTION OF AVAILABLE ENERGY. 
nee Maintenance energy.t Energy of milk solids. Energy balance. 
creatinblé Per ct. of i Per ct. of Per ct. of 
energy total total total 
used Calories available Calories available Calories available 
daily.* daily. energy. daily. energy. daily. energy. 
Cow 12. Cal. \ 
Period 1.... 82118 13846 43.1 11176 34.8 7096 ne 
Period 22... oL1f185 13846 43.6 10169 32.1 7703 24.3 
#£eriod a. ...' 3038385 13846 45.3 10547 30.4 5942 24.3 
CG A cpivie wes 2LOlO 10152 Ble 8451 30.9 8717 oner 

* After allowing for loss of energy in methane. 
+ Caleulated on basis of 13,000 Cal. for 500 kilo animal. 
