58 Report of Department of Animal Husbandry of the 



It is noteworthy, as lias been pointed out by other observers, 

 that the dry matter of the feces has a unit heat value consider- 

 ably larger than that of the total dry matter of the ration and 

 consequently the heat value of the digested portion should not 

 be assumed on the basis of the proportion of the dry matter 

 digested. 



In computing the energy value of rations it has been custom- 

 ary to use the figures proposed by Rubner for the several classes 

 of, nutrients, viz.: Protein 4.1 Cal., carbohydrates 4.1 Cal. 

 fats 9.3 Cal. It appears now that these unit values are, if any- 

 thing, fully high enough for herbivora, even if no allowance is 

 made for loss of methane. Let us compare the actual heat 

 values of the digestible matter in the several periods with what 

 the calculated values would be on the Rubner basis. 



Cow 12. 

 First Period. 



Protein S161.3 grams x 4.1= 33,4G1.3 Cal. 



Carbohydrates 52r;.j8.2 grams x 4.1=218, 7G8.6 Cal. 



Fats ISO. 3 grams X 9.3= l,G76.8Cal. 



253,906.7 CaL 

 As determined* =254, 515 . 1 Cal. 



Seco)id Period. 



Protein 6852.5 grains x 4.1= 28,095.2 Cal. 



Carbohydrates 55255.1 grams x 4.1=226,545.0 Cal. 



Fats 216.9 grams X 9.3= 2,017.2Cal. 



256.658.3 Cal. 

 As determined* =252,701.7 Cal. 



TJiird Period. 



Potein 5763.7 grains X 4.1= 23,631.2 Cal. 



Carbohydrates 62098.9 grains x 4.1=258,065.5 CaL 



Fats 258.5 grains X 9.3= 2.404.0Cal. 



284, 100.7 Cal. 

 As determined* =277,565.0 Cal. 



Cow 10. 



Protein 8004.3 grams x 4.1= 33.063.6 Cal. 



Carbohydrates 60445.7 grams x 4.1=247,627.4 Cal. 



Fats 2904.1 grams x 9.3= 27,008.1 Cal. 



807,809.1 Cal. 

 As determined* =306,827.2 Cal. 



►No allowance for methane. 



