130 Maine Agricultural Experiment Station. 1918. 



Agreeing with the previous work of this laboratory it is 

 shown that a pigmented tongue is dominant to a non-pigmented 

 one. 



A black switch appears to cause the suppression of the other 

 switch colors hi the offspring. Because of this suppression and 

 because all of the matings had at least one animal with a black 

 switch as parent, it was impossible to study the behavior of the 

 other colors. There was one case of segregation of a deep red 

 orange switch from a back cross of a black animal carrying an 

 orange coat and white switch, genetically. This case showed 

 the separation of the factor for this red from that for both white 

 and black. 



The character of polledness has been studied. Two horned 

 animals resulting from crosses of polled x horned appeared. 

 On the basis of the other results these could not have resulted 

 from a heterozygous polled condition. One of these cases had 

 the horns tight on the head and the other loose. These c?ses 

 then form exceptions to the previously accepted hypothesis of 

 simple dominence for the polled character and require a subsi- 

 diary hypothesis. The hypothesis suggested is that the male 

 sex organs have some action on the presence or absence of 

 horns. Partial proof of this hypothesis is given by the fact 

 that of the polled animals 10 were females, two males one of 

 which was doubtfully polled. Of those with scurs one female 

 and 7 males had loose scurs; of those with tight scurs all (3) 

 were males; of those with horns, all (2) were males. This 

 would seem like a clear case where the male has some influence. 

 The explanation of this difference appears to be due to a sub- 

 stance secreted by the germ cells. Should this prove true this 

 forms an interesting parallel between cattle and sheep where the 

 sex glands are known to produce such changes. 



The inherited characters of the beef type are shown to 

 effect the 4 general regions of the body, head, fore quarters, 

 body and hind quarters differentially. The type of head and 

 heavy, deep fleshed fore quarters are transmitted to the off- 

 spring when either parent is of Aberdeen-Angus breed. The 

 body and hind quarters appear intermediate but in most cases 

 resemble the dairy parents. 



