218 Maine Agricultural Experiment Station. 1918. 



inguinal region only for this alone appears as such a dominant; 

 The white spots on the face (star, star snip and blaze) neckj 

 shoulders, rump, flanks and legs are, in general, suppressed ii 

 the offspring when animals with these markings are mated tc| 

 solid colored animals. 



"As has been suggested but as has never been tested befort 

 the pigmented muzzle is dominant to the unpigmented muzzle. 



"A black switch appears to cause the suppression of the 

 other switch colors in the offspring. Because of this suppresj 

 sion and because all of the matings had at least one animal witl 

 a black switch as parent, it was impossible to study the behavior 

 of the other colors. There was one case of segregation of 

 deep red orange switch from a back cross of -a black anima 

 carrying an orange coat and white switch, genetically. Thit 

 case showed the separation of the factor for this red from tha 

 for both white and black. 



"The character of polledness has been studied. Two hornec 

 animals resulting from crosses of polled x horned appeared 

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

 from a heterozygous polled condition. One of these cases hac 

 the horns tight on the head and the other loose. These case; 

 then form exceptions to the previously accepted hypotheses o 

 simple dominence for the polled character and require a sub 

 sidary hypothesis. The hypothesis suggested is that the mal< 

 sex organs have some action on the presence or absence of horns 

 Partial proof of this hypothesis is given by the fact that of th< 

 polled animals 10 were females, 2 males, 1 of which w T as doubt 

 fully polled. Of those with scurs 1 female and 7 males hac 

 loose scurs; of those with tight scurs all (3) were males; 

 those with horns, all (2) were males. This would seem like 1 

 clear case where the male has some influence. The explanatioi 

 of this difference appears to be due to a substance secreted tr 

 the germ cells. Should this prove true this forms an interesting 

 parallel between cattle and sheep where the sex glands ar< 

 known to produce such changes. 



"The inherited characters of the beef type are shown to b 

 divisible into 4 general regions of the body, head, fore quarters 

 barrel and hind quarters. The type of head and heavy, deej 



