310 PRINCIPLES OF ANIMAL NUTRITION. 
Meadow hay I, Ox A... .. ee eee eee 4509 Cals. 
BAB OE: Tile cc ae als ale aahdears te 4408“ 
Ee ee, one elm are he 4317 Cals. 
: 4357 “ 
at OB. MENT aa wa 4398 “ 
Be ARIE RENE creases sales 4452 « 
Ae Oe ST ge, Se Mere aig bias Pa akases 4371 “ 
« EBON 0 BS cneniarg 4355 Cals 
¥ 4427 “ 
a tM. SE Gedaeaieas 4495 “ ' i 
OND Aes beg ae 4534 “ 
c EON 8 Esta @ starts 4601 “ | 53 ee 
td BONED, FE DV scot ache 4502 “ 
Average of 7 kinds ............... 005: 4437 “ 
Oat straw, Ox°Riacsciccek Meter eee eaves 4443 Cals. 
" EO ORGS ica aiv ae Wikia tae oe Ree 4584 “ 
AVeTAPG icles 1459, Gis an ae RA eet 4513 “ 
Wheat straw, Ox H........ 0... ee eee eee 4553 Cals. 
i ORM Mn Bieta aac Lee. 4887 
AVETHOC: o.o3 uty evias eeuee te ox eaets 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. 
Lossus IN MetHane.—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 
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