432 NUTRITION OF FARM ANIMALS 



TABLE 109. RELATION OF WEIGHT OF PIGS TO FEED CONSUMED 



TABLE no. FEED CONSUMPTION BY LAMBS 



But the maintenance requirement is approximately propor- 

 tional to the body surface. Consequently the feed consump- 

 tion as the animal grows older does not keep pace with the in- 

 crease in its maintenance requirement, so that a constantly 

 diminishing proportion of its feed is available for productive 

 purposes. For example, in Periods I and X respectively of 

 Weiske's experiment it may be computed that the metaboliz- 



