June i, 1921 
Some Fundamentals of Stable Ventilation 
361 
tion to the total heat production is likewise about the same as in cattle. 
The apparent agreement of these relationships between two so widely 
different species leads to the assumption that the results are, at least for 
this purpose, applicable also to swine. By using, therefore, the method 
of computation previously described for cattle, the heat emission by 
radiation and conduction, the latent heat of water vapor, the amount of 
water vapor, and the amount of carbon dioxid produced by swine are 
obtained. 
HEAT PRODUCTION OF SHEEP 
FASTING KATABOEISM 
No direct determinations of the fasting katabolism of sheep are on 
record. From the rather scanty data regarding the maintenance ration 
of sheep available Armsby (j, p. 711) has computed by an indirect 
method, based on results with cattle, the fasting katabolism of sheep 
weighing 100 pounds to be 791 calories, and in proportion to the two- 
thirds power of live weight as given in Table XV. 
Table XV .—Fasting katabolism of sheep 
Live weight. 
Fasting 
katabolism 
per head. 
Live weight. 
Fasting 
katabolism 
per head. 
Pounds. 
20 
40 
60 
80 
100 
Calories. 
270 
430 
560 
680 
791 
Pounds. 
120 
140 
160 
180 
200 
Calories. 
890 
990 
1,090 
1, 170 
1,250 
HEAT INCREMENT DUE TO CONSUMPTION OF FEED 
No determinations of the increment of heat due to the consumption 
of feed by sheep have been reported, but it appears probable that the 
results obtained with cattle (Table II) may be applied to sheep without 
very serious error. 
RATIONS FOR SHEEP 
The average rations and live weights upon which the computation 
of the heat emission by sheep is based were taken from several sources. 
For fattening lambs, the average ration and live weight given by Henry 
and Morrison (jo, p. 521) in their summary of the results on sheep of 
several different experiment stations were used as an example. For 
breeding ewes, the average ration and live weight given by Hackedom 
(9) was used. The average ration for maintenance was taken from 
Bulletin 143 of the Bureau of Animal Industry, United States Depart¬ 
ment of Agriculture (2), the ration being given in terms of metabolizable 
