Energy in Animals 4 1 



and time is a factor in the measurement of 

 energy. If energy concentrated in the organs 

 of an animal by work performed after sexual 

 maturity has a sexual character, then it 

 would be obviously improper, in considering 

 the inherited energy of a stallion, to measure 

 by the age of his dam, and it would be equally 

 improper to use the age of the sire when the 

 animal considered is a mare. When it comes 

 to geldings, questions arise which require 

 that they be placed in a class by themselves 

 until investigation shows what relationship 

 they have to sexually perfect males and 

 females. 



In mammals, the period of gestation is a 

 resting stage during which there is little or no 

 energy accumulated by reason of outside 

 work performed. The dissipation of energy, 

 however, continues through this resting stage, 

 with the result that the young animal has 

 less energy than the parent, and arrives at the 

 parental quantity of energy only after a 

 considerable amount of work has been per- 

 formed subsequent to birth. How much 



