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58 REPORT-OF DEPARTMENT OF ANIMAL HUSBANDRY OF THD 
It is noteworthy, as has 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. 
ETOULGIN vais iw e's s 6 bh 08 4 400s OL ete Te eee ae 461.3 Cal. 
Carbohydrates ..... ceccveees O2O08,2 grams x 4:1-=218, 768:6 Gan 
OA Reet oA Waly Oia, 190 Beeratins Geo 1,676.8 Cal. 
253, 906.7 Cal. 
As determined* =254, 515. 1Gak 
Second Period. 
Proternwais's sate ae iw ese ee ee 6852.5 grains x 4.1= 28,095.2 Cal. 
Carbohydrates .. 3. desicice see Doe). 1) grams x 4.1226, 04h. eee 
Tats seweswecsaveceaveapeces 216-9 crams x 95-00 -ee 
256, 658.3 Cal. 
As determined* 252, (Ul. ee 
Third Period. 
Potein tees sic Ve Pesce cdls de Slee Diba) Tf grains x 4 l= DS 56SiSa eae 
CALUGHVOTALGS”.\...5 6 fa eee o . 62698.9 grains x 4.1=258, 065.5 Cal. 
Wats cccccccwevesccgescclut ovis 5200. Ri2TAIUS & fc 05= reel 
284,100.7 Cal. 
As determined* =277,565.0 Cal. 
Cow 10. 
Protein Ce ee ee ee rr ry ee 8064.3 grams x 4.1= 33,063 .6 Cal. 
Carbohydrates ..... covcecess 60445.7 grams x 431=247,827 40ab 
Dats cad eccceceivecvcveseen 24,1 prams x9.g= 27,008 ee 
807,899.1 Cal. 
As determined* ==306, 827.2 Cal, 
*No allowance for methane, 
