Energy in Animals 53 



the dynamic condition of the dam at the age 

 of three. With this dynamic condition de- 

 termined with as much accuracy as the facts 

 will permit, we can compare it with the 

 average dynamic condition of brood mares as 

 it is known to exist in breeding establish- 

 ments, and from this comparison can deter- 

 mine whether the maternal concentration 

 was positive, negative, or neutral. 



This is the first step in examining into the 

 manner in which energy is or may be con- 

 centrated in a 2 : 10 trotter. The second step 

 is to make a similar examination, properly 

 modified, into the concentration by the 

 grandparents. If the trotter is a stallion, the 

 two grandsires are examined in the same 

 way that the sire of a stallion is examined. 

 If the trotter is a mare or a gelding, the 

 maternal grandsire is examined and esti- 

 mated in the same way that the sire of a 

 mare or gelding is examined and estimated, 

 but not so with the paternal grandsire. In 

 this case we divide the grandsire's concentra- 

 tion into two parts, — that which is an ordin- 



