142 



Maine Agricultural Experiment Station. 1918. 



this conclusion to the other breeds which have been used in the 

 crosses for our crossbred herd. 



TABLE VIII. 



Inheritance of Tongue Pigment. 





Mating. 





Character 



of resulting offspring. 



Sire 





Dam 









White 

 White 

 Pigmented 



Pigmented 



X 

 X 

 X 



X 



White 



Pigmented 



White 



Pigmented 



3 



7 

 11 



10 



White 



Pigmented, 



Pigmented, 



White 

 Pigmented 



1 Pigmented and White 



2 White, 3 Pigmented and 



Pigmented 

 White 



X 



Pigmented 



2 



Pigmented 





Pigmented 





Pigmented 











X 





2 



White 





White 



White 





Pigmented 



X 



White 



1 



White 





White 





In these crosses pigmented x pigmented gave all pigmented, 

 white x white gave all white, and crosses of pigmented x white 

 produced largely pigmented offspring. The second generation 

 offspring from pigmented tongued hybrids both came white 

 tongues showing the separation of the factors for the pigmented 

 and unpigment condition in the first generation parents. These 

 facts strengthen the hypothesis that the pigmented condition 

 of the tongue is inherited through a dominant factor. 



THE INHERITANCE OF THE HORNED CONDITION. 



The inheritance of the polled condition as a simple mende- 

 lian dominant was first suggested by Bateson and Saunders 7 

 through their studies on show cattle. Spillman in further 

 studies during the year 1905 confirms this view and makes the 

 interesting suggestion without support of numerical evidence, 

 that the horned condition is dependent to some extent on sex. 

 This suggestion, although denied by later investigators, has 

 proved helpful in explaining certain exceptions to the strict men- 

 delian explanation which occurred in our data. The table 

 shown below records the data of these crosses according to sex. 



