52 



MAINTENANCE RATIONS OF FARM ANIMALS. 



the figures contained in the third column of the following table. Kellner 1 has 

 recomputed the results, using the exact figures for the carbon, nitrogen, and 

 energy content of the flesh of swine which were obtained by Kohler, with the 

 results shown in the last column. 



Fasting Jcatabolism of swine — Meissl, Strohmer, and Lorenz. 



Live 

 weight. 



Fasting katabolism. 



Armsby. Kellner. 



Kilos. 

 140 

 120 



Therms. 

 2. 607 

 2. 291 



Experiment V.. 

 Experiment VI. 



Computing Kellner' s figures to uniform live weight in proportion to the 

 surface we have : 





Per 50 

 kilo- 

 grams. 



Per 100 

 pounds. 



Experiment V 



Therms. 

 1.377 

 1.333 



Therms. 

 1.290 



1.249, 



Experiment VI 



Average 



1.355 



1.270 





These figures, according to the principles enunciated in the foregoing pages, 

 may be regarded as representing the available energy required for mainte- 

 nance. No other direct determinations of this requirement appear to have been 

 made. 



In addition to the foregoing, a number of live-weight experiments 

 have been reported. 



Dietrich 2 determined the amount of feed required by growing pigs to maintain 

 their live weight at different stages of growth. The trials were made when the 

 animals reached approximately the weights of 50, 100, 150, and 200 pounds, 4 

 animals being used. The digestibility of the ration fed at the weight of 150 

 pounds was also determined. The actual average amounts of feed required per 

 day and head were as follows : 



Maintenance rations of swine at different ages — Dietrich. 



Period. 



Averago 



live 

 weight. 



Feed required for mainte- 

 nance. 



Corn Mid- 

 meal, dlings. 



Skim 

 milk. 



I 



Pounds. 

 49.62 

 98. 75 

 151. 25 

 201.37 



Pounds. 1 Pounds. 

 0.15 0.15 

 .40 .40 

 .80 .80 

 .67 1.33 



Pounds. 

 1.2 

 1.6 

 1.6 



II 



Ill 



IV 







1 Die Erniihrung dor Landwirtschaftliche Nutztiere, 5th ed., p. 156. 



2 Wisconsin Experiment Station, 16th Report, 1809, p. 31. 



