New York Agricultural Exferiment 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 

 energv of a ration. It mav 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. 



Methane i Available energy 



"iXS ]No.-aval,abIe energy. !™« 



Assumed f Available energy 



methane J ^ Urine 



Per. 1. 



Per ct. 



. 64.3 

 . 2.0 

 . o2.S 



. .JH.S 

 2.9 



energy 

 deducted 



..i 



Xon-available energy. < Methane. 7.5 



^I 



eces 



32.8 



Cow 12. 

 Per. 2. 



Per ct. 



G.3.2 

 2.7 



.34.0 



.5.1.. 5 

 2.7 

 7.7 



34.0 



Per. 3. 



Per ct. 



61.6 

 2.4 



36.0 



53.9 

 2.4 

 7.7 



36.0 



Cow 10. 



Per ct. 



68.4 

 3.2 



28.4 



60.9 

 3.2 

 7.5 



28.4 



Co^D 12. 

 Period 1. .. 

 Period 2. ., 

 Period 3... 



Cow 10 , 



Distribution of Available Energy. 



Maintenance energy.t Energy of milk solids. 



Total 



available 



energy 



used 



daily.* 



Cal 

 32118 



31718 

 30335 

 27320 



Calories 

 dail.v. 



13S46 



13846 

 33S46 

 10152 



Per ct of 



total 



available 



energy. 



43.1 



43.6 

 45.3 



Calories 

 daily. 



11176 



10169 



10.547 



8451 



Per ct. of 



total 

 available 



energy. 



34.8 



32.1 

 30.4 

 80.9 



Energy balance. 



Per ct. of 

 total 

 Calories available 

 daily. energy. 



7090 



7703 

 5942 

 6717 



22.1 

 24.3 

 24.3 

 32.1 



♦After allovring for loss of energy in methane. 



t Calculated on basis of 13,000 Cal. for 500 kilo animal. 



