310 PRINCIPLES OF ANIMAL NUTRITION. 
Meadow hay I, Ox A....... eee eee eee 4509 Cals. 
& gar: oma 6 Enceneete relict 4408 “ 
e IB SOON awed 4317 Cals. 
J 4. cc 
Be oS Veet cue 4398 “ ald 
‘ BMS Rete Siecae eateeis Gury ios 4452 “ 
sake) G (me as Cepeda ae etree ce eer 4371 “ 
ne Ae eee 4355 Cals. 
tM SS Gauena cs 4495 “ \ sor " 
" if VI 8 Hie acengea 4534 “ 
a Zam) Caan) s Orne yeeeyee 4601 ‘ 4535 “ 
ee Be OV Tg J be ealer eek 4502 “ 
Average of 7 kinds ..................5- 4437 “ 
Oat straw, Ox Fle... cee eee eee ee eee 4443 Cals. 
A ae, E) 2] Seen ree Ory ren oe 4584 “ 
AV OTARC ii yf cae deste see sae tele 4513 “ 
Wheatistraw; OX H ws scsece cess awew ee nee 4553 Cals. 
a MO OX diesasanininnss--83 sees aes 4387 “ 
AVETABE oho Uh Gisiauiie aS saree Gales seats 4470“ 
The digestible matter of the straw has apparently about the same 
heat value as that of hay. 
Metabolizable Energy. 
Protein.—A portion of the gross energy of the digested protein 
is removed in the urea and other nitrogenous products of metabo- 
lism, and in addition to this there is to be considered the possibility 
of a loss of energy by fermentation in the digestive tract. 
Lossrs 1N MretHanre.—In nine of the Mockern experiments in 
which wheat gluten or flesh-meal was added to the basal ration, the 
amount of carbon excreted in the form of hydrocarbons per day 
and head was as tabulated on the opposite page. 
The differences between the excretion with and without gluten 
are small in amount and are sometimes positive and sometimes 
negative, the averages being probably within the limit of experi- 
mental error. The percentage losses of energy in methane as 
