Inheritance Studies of Dairy and Beef Breeds. 



141 



the second generation a number of cases of segregation of the 

 white from the black and of solid colored red from the white 

 and black appeared lending further evidence toward the single un- 

 it nature of the inherited factors behind these colors. 



ON THE INHERITANCE OF MUZZLE PIGMENT. 



The evidence gathered together in Table VII shows that the 

 suggestion made by Spillman without the presentation of evi- 

 dence that the pigmented muzzle was dominant to the unpigment- 

 ed condition was a correct interpretation of the facts of the 

 case. 



TABLE VII. 

 Inheritance of Muzzle Pigment. 



Mating. 



Character of resulting offspring. 



Sire 



White 



Pigmented 



Pigmented 



White 



Pigmented 



Pi 



Pi 



White 



Pigmented 



White 



Dam 



Pigmented 

 Pigmented 

 White 



Fi 



Pigmented 



White 



Pigmented 



Pigmented 

 White 



14 Pigmented 



23 Pigmented 



3 Pigmented 



1 White with small black spots 

 3 Pigmented 



3 Pigmented 



This table shows that in the first generation of crosses of 

 pigmented x pigmented there were 23 animals produced with 

 pigmented muzzles. One case where a modified form of sepa- 

 ration of the pigmented from the white condition is seen in one 

 of the second generation animals where the muzzle was white 

 with small black spots scattered over it. These results easily 

 prove the pigmented condition dominant to the unpigmented. 



ON THE INHERITANCE OF TONGUE PIGMENT. 



In a previous paper from this laboratory 6 the pigmented 

 condition of the tongue in Jersey cattle was shown to be dominant 

 to the unpigmented condition. The table given below extends 



