GONADS AS CONTROLLERS OF CHARACTERISTICS 



463 



TABLE 2— Continued 



AGE IN DAYS 



CASTRATED MALES 



Number of 

 animals 



Average weight 



SPAYED FEMALES 



Number of 

 animals 



Average weight 



WEIGHT OF MALES 

 ABOVE FEMALES 



Litter 25 A^B^ 



examination of this percentage column shows that only in four 

 instances was the average female weight equal to or greater than 

 the average male weight of a given Utter. The weight of the 

 males in these four cases, not only reached that of the females 

 before the age of sixty days, but increased gradually as growth 

 continued. 



By using the average weight of each sex of each litter at 

 comparative ages as given in table 2, the average weight of the 

 males and females of all seven litters has been expressed in the 

 form of a growth curve in figure 1. The broken fines from 

 thirty to sixty days is only approximately correct due to the 

 fact that all litters were not weighed at exactly the same age 

 prior to the sixtieth day. 



