54 MAINTENANCE EATIONS OE EARM ANIMALS. 



Carlyle 1 reports the average daily food for maintenance of 12 brood sows for 

 eight weeks after weaning their pigs as follows : 



Pounds. 



Average live weight 306 



Feed per day and head : 



Corn 1.49 



Shorts i. 49 



Oil meal . 50 



Skim milk 6. 90 



The computed digestible nutrients and energy of the above ration are : 



Pounds. 



Digestible protein 0. 654 



Digestible carbohydrates 2. 307 



Digestible fat .117 



Equivalent metabolizable energy : Therms. 



Per head 6.079 



Per 50 kilograms live weight 3. 077 



Per 100 pounds live weight 2. 884 



In a preliminary report of experiments upon pig feeding, Dietrich 2 estimates 

 the maintenance ration of growing pigs per 100 pounds live weight to be : 



Pounds. 



Digestible crude protein 0. 10 



Digestible carbohydrates . 40 



Digestible fat .04 



This ration, using the same factors as before for the metabolizable energy, 

 is equivalent to 1.181 therms per 50 kilograms or 1.107 therms per 100 pounds 

 live weight. 



The foregoing results show a wide range in the apparent food 

 requirement for the maintenance of live weight. In general, the 

 lower results seemed to have been reached with the younger animals. 

 This may be due, however, to the fact that, as will be shown in a 

 subsequent paragraph, the maintenance of live weight in a young 

 animal is not necessarily synonymous with the maintenance of its 

 store of potential energy. If we omit the results obtained with the 

 50-pound animals and also omit Dietrich's results at the Illinois 

 Station, since his experiments seem to have been with comparatively 

 young animals, we find the range of results to be as follows: 





Per 50 

 kilo- 

 grams. 



Per 100 

 pounds. 



Minimum 



Therms. 

 1.523 

 3. 077 

 2. 243 



Therms. 

 1.427 

 2.884 

 2. 102 



Maximum 







On the basis of respiration experiments by Meissl as discussed 

 by Kellner, 3 four rations consisting of not dissimilar feeds showed 



1 Wisconsin Experiment Station. Bulletin 104, p. 31. 



2 Illinois Experiment Station, Circular 126, p. 116. 



3 Die Ernlihrung der Landwirtschaftliche Nutztiere, 5th ed., p. 157. 



