358 
Journal of Agricultural Research 
Vol. XXI, No. 5 
Daily ration for light horses that get only about enough exercise to 
keep them in good condition per 1,000-pound horse: 
8 pounds of oats. 
2 pounds of wheat bran. 
io pounds of timothy hay. 
Daily ration for 1,500-pound geldings at moderate work: 
9 pounds of oats. 
9 pounds of ear com. 
7X poimds of timothy hay. 
7X pounds of clover hay. 
TOTAL HEAT PRODUCTION 
The total heat increment due to the ration fed, computed in the manner 
described, plus the fasting katabolism of the horse, gives the total heat 
production of horses of the weights and consuming the rations just 
specified when performing no work. The heat production is, of course, 
greatly increased during work, but plainly this additional heat is not 
ordinarily available as motive power for ventilation. 
Table X .—Total heat production per day and per head by typical horses at rest 
Animal. 
Live 
weight. 
Heat. 
Eight horses. 
Pounds. 
1,000 
i,5°o 
Calories . 
10,853 
14,835 
Heavy work horses. 
HEAT EMISSION BY RADIATION AND CONDUCTION, WATER VAPOR, AND 
CARBON DIOXID PRODUCED BY HORSES 
On the assumption that approximately the same relation exists as in 
the case of cattle between the total heat emission and the latent heat of 
water vapor and between the heat and the carbon dioxid produced by 
horses, a computation was made of the heat given off by radiation and 
conduction, the latent heat of the water vapor, the amount of water 
vapor, and the amount of carbon dioxid produced by horses. The method 
described above for cows was used, and the results are shown in Table XI. 
Table XI .—Heat emission by radiation and conduction , water vapor , and carbon dioxid 
produced per day and per head by typical horses at rest 
Animal. 
Live 
weight. 
Heat emis¬ 
sion by 
radiation 
and con¬ 
duction. 
Latent 
heat of 
water 
vapor. 
Amount of 
water 
vapor. 
Carbon 
dioxid. 
Eight horses.. 
Heavy work horses.. 
Pounds. 
1,000. 
1,500 
Calories. 
8, 140 
11,126 
Calories. 
2 » 7 J 3 
3.709 
Gm. 
4,622 
6,319 
Gm. 
4,341 
5,934 
