360 
Vol. XXI, No. 5 
Journal of Agricultural Research 
TOTAL, HEAT PRODUCTION OF SWINE 
Since 417 calories represent the increment in heat production by swine 
per pound of dry matter eaten, the heat increment caused by the con¬ 
sumption of feed by swine is computed on the basis of the foregoing 
estimates by simple multiplication. To this the fasting katabolism of 
the animal as found in Table XII is added, and the total heat production 
is thus obtained (Table XIII). 
Table XIII .—Total heat production of typical swine 
Animal. 
Live 
weight. 
Total heat 
emission. 
Suckling pig. 
Pounds. 
Calories. 
1,034 
Weanling pig. 
*O 
Shote, young.. 
o u 
Shote, well-grown.. 
4 , 147 
5 > 2 ll 
5,468 
4,033 
4, 942 
5, 806 
4,033 
e fieR 
Fattening hog.. 
Farrowing hog. 
3 00 
Breeding'gilt... 
Breeding yearling sow. 
Breeding old sow"!. 
Breeding boar, young..... 
Breeding boar, yearling. 
Breeding boar, old_ T. .. . 
600 
U, U3U 
HEAT EMISSION BY RADIATION AND CONDUCTION, WATER VAPOR, AND 
CARBON DIOXID PRODUCED BY SWINE 
Table XIV. —Heat emission by radiation and conduction, water vapor, and carbon 
dioxid produced by typical swine per day and per head 
Animal. 
Live. 
weight. 
Heat emis¬ 
sion by ra¬ 
diation and 
conduction. 
Latent heat 
of water 
vapor. 
Amount of 
water 
vapor. 
Carbon 
dioxid. 
Suckling pig. 
Pounds. 
Calories. 
Calories. 
Gm. 
Gm. 
25 
776 
259 
441 
414 
Weanling pig.. 
50 
1, 263 
421 
717 
674 
Shote, young. 
100 
2,013 
671 
1,143 
1,074 
Shote, well-grown. 
150 
3, no 
3, 908 
i, °37 
1, 767 
I,659 
Fattening hog. 
200 
*,303 
2,220 
2,084 
Farrowing hog. 
300 
4,104 
h 367 
2,329 
2, 187 
Breeding gilt. 
300 
3,025 
1,008 
1, 717 
1,613 
Breeding yearling sow. 
400 
3 , 707 
it 2 35 
2,104 
I, 977 
Breeding old sow. 
500 
4,355 
i, 45 i 
2,472 
2, 322 
Breeding boar, young. 
300 
3,025 
1,008 
it 389 
1, 7 I 7 
if 613 
Breeding boar, yearling. 
450 
4,169 
2,366 
2, 223 
Breeding boar, old.. 
600 
4,977 
1,659 
2,826 
2,654 
The results of experiments on man (7) indicate that the heat emission 
by radiation and conduction is on the average not far from 75 per cent of 
the total heat emission, and that the relation of the carbon dioxid produc- 
