MAINTENANCE KATIONS OF SWINE. 53 



Assuming the composition of the feeding stuffs used to be fairly represented 

 by the averages given in Farmers' Bulletin 22 (revised) and using Jordan's 

 digestion coefficients for middlings, oil meal, and skim milk, and Kellner's 

 coefficients for corn meal, the writer has computed the digestible nutrients 

 contained in the rations consumed with the results shown in the following table. 

 The metabolizable energy of the rations has been computed from the amount of 

 digestible nutrients, using the factors — 



Calories per gram. 



Digestible protein 4. 1 



Digestible nitrogen-free extract 4. 2 



Digestible crude fiber 3. 5 



Digestible ether extract 8. 8 



Computed digestible nutrients and metabolizable energy per day — Dietrich's 



experiments. 



Digestible nutrients per head. 



i 



Metabolizable energy. 



Period. 



j Protein. 



I 



1 



Carbohy- 

 drates. 



Fat. 



Per head. 



Per 50 kilo- 

 grams live 

 weight. 



Per 100 

 pounds live 

 weight. 



1 Pounds. 



I ! 0.065 



II 1 .126 



III .204 



IV .205 



Pounds. 



0. 241 

 .561 



1. 038 

 L 159 



Pounds. 

 0. 012 

 .028 

 .050 

 .057 



Therms. 



0. 628 



1. 415 



2. 556 

 2.817 



Therms. 

 1. 069 

 1. 523 

 2. 069 

 1.885 



Therms. 

 1.002 

 1.427 

 1. 939 

 1.766 



Taylor 1 reports quite similar experiments with animals weighing respec- 

 tively 50, 100, and 150 pounds. Computed in the same manner as the previous 

 experiments, the results are as follows : 



Maintenance rations of sicine at different ages — Taylor. 



Period. 



Average 



live 

 weight. 



Feed required for mainte- 

 nance. 



Shorts. 



Corn 

 meal. 



Oil 

 meal. 



I 



Pounds. 

 52.1 

 103.5 

 157.0 



Pounds. 

 0.48 

 1.14 

 1.20 



Pounds. 

 0. 24 

 .57 

 .60 



Pounds. 

 0.08 

 .19 

 .20 



Ill 



V 





Computed digestible nutrients and metabolizable energy per day — Taylor's ex- 

 periments. 



Periods. 



Digestible nutrients per head. 



Metabolizable energy. 



Protein. 



Carbohy- 

 drates. 



Fat. 



Per head. 



Per 50 kilo- 

 grams live 

 , weight. 



Per 100 

 pounds live 

 weight. 





Pounds. 



Pounds. 



Pounds. 



Therms. 



Therms. 



Therms. 



I 



0. 096 



0.434 



0. 025 



1. 105 



1. 821 



1.707 



Ill 



.288 



' 1. 030 



.058 



2. 618 



2.730 



2. 558 



V 



.240 



1.083 



.061 



2.753 



2. 174 



2.037 





1 Wisconsin Experiment Station Report, 1901, p. 67. 



