June i, 1921 
Some Fundamentals of Stable Ventilation 
359 
HEAT PRODUCTION OF SWINE 
PASTING KATABOUSM 
The fasting katabolism of swine has been determined independently 
by Meissl ( 16) and by Tangl (17) by starving the experimental animals 
for comparatively short periods and measuring the katabolism by means 
of a respiration apparatus. The average of their results, computed per 
100 pounds in proportion to the two-thirds power of the live weight, is 
1,250 calories. The fasting katabolism of swine, computed according 
to their live weight, is given in Table XII. 
Table XII .—Fasting katabolism of swine 
Live weight. 
Fasting katab¬ 
olism per head. 
Live weight. 
Fasting katab¬ 
olism per head. 
Pounds. 
2 5 
50 
IOO 
150 
200 
Calories. 
49 6 
786 
1,250 
^637 
1,984 
Pounds. 
300 
400 
45 ° 
600 
Calories. 
2,599 
3.149 
3 . 4 o 6 
4,126 
HEAT INCREMENT DUE TO CONSUMPTION OF FEED BY SWINE 
The data regarding the increment of heat production consequent on the 
consumption of feed by swine are rather meager. Of these, the results 
of several investigators on grains and on a mixed ration consisting of 
rice, flesh meal, and whey, as reported by Armsby (j, p. 656), are con¬ 
sidered trustworthy; and the average of these, 417 calories per pound of 
dry matter eaten, is taken to represent the energy expenditure by swine. 
RATIONS FOR SWINE 
The rations and live weights of the animals, upon which the computa¬ 
tion of heat emission by swine has been based, are those furnished at the 
request of Mr. Clarkson, by Prof. J. M. Eward of Iowa Experiment 
Station. The weights of the animals and the daily feed eaten, reduced 
for convenience to dry matter, are the following: 
Class. 
Weight. 
Dry matter 
of daily 
feed eaten. 
Suckling pig . 
25 
50 
IOO 
150 
200 
3 00 
300 
400 
5 00 
3 00 
450 
600 
Pounds. 
I. 29 
2- 15 
3 - 44 
6. 02 
7 - 74 
6. 88 
3 - 44 
4 . 3 ° 
5. 16 
3 - 44 
5. 16 
6. 02 
Weanline pie.. 
Shote, young. 
Shote, well-grown . 
Fattening hog. 
Farrowing hog . 
Breeding gilt . 
Breeding yearling sow .. 
Breeding old sows, year or over . 
Breeding boar, young . . 
Breeding boar, yearling . .. 
Breeding boar, old. 
42269°—21 - 6 
