542 PRINCIPLES OF ANIMAL NUTRITION. 
and these computations in turn supply a check upon the hypoth- 
esis of the non-availability of crude fiber. 
Wolff makes the comparison by deducting from the total fiber- 
free nutrients 3300 grams per 500 kgs. live weight for maintenance 
and comparing the energy of the remainder with the amount of 
work done. In the following tabulation of his results this method 
has been pursued. For the energy of the fiber-free nutrients, 
Zuntz’s figure (3.96 Cals. per gram) has been used and the work of 
locomotion has been estimated at 50,000 kgm. per 100 revolutions 
of the dynamometer (compare p. 539). 
ruber tree Dae 
utrients ic] 
: Minus 3300 | Work Done. | 25 
Period. Ration. Grms. ge 
mo 
ado) 
Grms.| Cals.| Kgm. |Cals.| 7 . 
1891-92. 
IIc ....| Hay, 7.0 kgs.; oats, 4.5 kgs.............. 1,424] 5,639) 931,676'2,197/38.95 
Ts cl) oN S7aOe Ee SOON) A entiendayede a ateuate 1,990} 7,881)1,129,568 2,663/33.79 
TVinnccc| ' 4.6% ONTO acd utiade pene Rauilees 2,259 been 1,094 ,328'2,581/28.86 
AVOLARE  cisvnas ca ba men ia waded yhlanie Moboe|t Swe 4 fae fo [ged 6ee Rall Faeave OOn LO 
1892. 
Ta-d. Hay, 7.5 kgs.; oats, 4. . eS uF siivelg a wie sietiaee 1,775] 7,026]1,074,802/2,535/36 .07 
Tb: cj) 0 Ae 5.5 * straw, 1 kg....] 1.873] 7.416]1,153,813/2,720/36 .68 
Ill....} “ 4.5 “ grain,5.0kgs.; 1.5kgs.| 1,521] 6,023) 912,454'2,152/35.73 
IV.. a eee 8 Be “1.5 “ | 1,860) 7,365]1,186 ,577|2,799/38 .00 
Vv... BP), OAD 8? « OBES SAMO: OF ta hemes ia ar cdeetleuctes 1.903} 7,537/1,188 ,388|2,803/37 .18 
AVOCTALC. se sicix cetacean Gaia itty eines [oe PS Jaeceoe| oatttnn $32 eueewra (BOS TE 
1892-93. | 
‘tower Hay. 7.5 kgs.; oats, 4.0 kgs............... 1,475! 5.841] 897,678/2,116 36.24 
Ds a. ian (> aa eee Batt TY sxipele nutes h 8 2,297! 9,095/1,280,687/3, '024'33 20 
Ill. “6.0 ‘ Be WO GOL ee, = nat atte tee aie 1,670] 6,613} 905,568/2, 135/32 .28 
IVb “6.0 “ “5.5 ‘ ; straw, 1 kg. ..| 2,036! 8.063/1,167,127/2 1752)34.14 
Wiri.d “4.0 ‘ re eB a 1“... .| 2,577|10 1210] 1,421 .285|3.352. 32.85 
Vic. “4.0 ‘ 7B “2 kgs.. aeeer 10,660 oleae ini 3,655 34.28 
AVCTOBCS rcs tind aire Shei s BRE Mana eke dead Bs Reet ho MC eel ISTE 
1893-94. 
; oats. s 0 kgs. ; ; straw, 1.0 kg.} 1,607} 6,362} 900,267/2.122/33.36 
: 2.5kgs.} 2,580/10,220/1 549 ,262|3,653!35.76 
grain, z 0 es 2.5‘ .) 2,560/10,140:1 ,545,702]3, 645/35 .95 
as 3 “t se 2.5 48 5 esa 11 420! 1 ‘673 sis 3 3,048) 34.61 
sicsdetpataniiha Ries Maken suey AMS Rae oueallteea aia vee SBS 
In every instance but one the utilization as thus computed 
exceeds 31.3 per cent. In other words, the energy of the body 
material which, according to Zuntz & Hagemann’s results, must 
have been metabolized to produce the amount of work done exceeds 
considerably the amount computed to be available from the food. 
There being no reason to question the substantial accuracy of Zuntz 
& Hagemann’s factor, this means, of course, that if the food and 
work were in equilibrium our estimates of the energy available from 
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