Hcjlstein-Frieaians 153 



important sires. Ordinarily cows produre 

 calves twelve months apart. Here there 

 happen to be two cases in which De Kol 2d 

 had calves thirteen months apart, and one 

 case in which they were eleven months apart. 

 The two sons which De Kol 2d had thirteen 

 months after her previous calves are nearly 

 equal in merit and far above any of her other 

 sons. The one son which she had eleven 

 months after her previous calf was inferior 

 to any of the others. This matter has not 

 been examined sufficiently for any conclu- 

 sions to be drawn, but it appears to indicate 

 that a dam may have her energy exhausted 

 by producing offspring too close together, 

 and that an offspring born an unusually 

 short period after the next preceding one 

 will suffer because of that exhaustion. It 

 would also appear as if the result was due to 

 partial starvation during the period of 

 gestation. 



In the pedigrees of the 2 : 10 trotters it was 

 found, when successive generations of the 

 same sex were compared with successive 



