INHERITANCE OF COLOR IN PERCHERON HORSES. 



269 



resemble the dam, and of 1,000 fillies 537 or 53.7 per cent, re- 

 semble the dam, or the dam is prepotent in 54 per cent, of all 

 cases. The ratio between the prepotency of dam and sire is a 

 little less than 5:4. 



In the next table the sexes are separated on the basis of color 

 and we find that gray dams and black sires are greatly in excess, 

 being nearly 75 per cent, of the whole number. 



TABLE III. Colts. 

 PREPOTENCY IN RELATION TO BOTH SEX AND COLOR. 



Dams. 



TABLE IV. Fillies. 



Dams. 



Taking the table for the 1,000 colts first, we find that there 

 are 756 black sires and 244 gray sires, and correspondingly 756 

 gray dams and 244 black dams. The gray dams moreover are 

 prepotent in 56 per cent, of the cases and the black dams in only 

 49 per cent. The gray sires are prepotent in 5 I per cent, of the 

 cases and black sires in 44 per cent. These figures do not essen- 

 tially alter the previous results as to the prepotency of the dam 

 but indicate that the gray dam is more prepotent than the black 

 dam and the gray sire than the black sire. But the gray sire is 

 less prepotent than the gray dam (5 1:56). The relations may 

 be expressed thus : The combination of prepotent sex -f sub- 



