REGISTERED AS A ROAN 



Figure 3. According to the rules of the Short-Horn Breeders' Association, an animal 

 which exhibits roaning on any part of the body may be registered as a roan. Since this is 

 a more popular color than red and white, animals which can be entered as roans are gener- 

 ally so recorded. When roaning occurs on only a small ipart of the body, as in this case, 

 the animal is assumed to be heterozygous for the extension factor which differentiates the 

 roan pattern from the red and white. This animal is not of the same genetic constitution 

 as the pure roan shown in Figure 4. The pedigree of this animal is given below. 



PEDIGREE OF ROSEWOOD RADIUM 512686— ROAN 



^ Double Dale 

 Radium J 337156 Roan 



385197 White | Lady Fragrant 



Roan 



Sire 



Dam 



Crestmead Rosewoo'd 

 129176 Red 





Scottish Goods 

 292932 Roan 



Rosewood 87th 

 Roan 



genetically speaking, not separate colors 

 at all, but are obviously a rearrange- 

 ment of the two colors red with white 

 ju.st discussed. The question of an in- 

 dividual becoming a roan or red-and- 

 white must then depend on tlie intro- 

 duction of an extension factor, which 

 we may designate by (E). 



Taking the red color as the basis 

 of all combinations it can be repre- 

 sented as a definite color factor (R). 

 The total absence of (R) gives a white 



individual. White, then, in Short- 

 Horns, is not genetically speaking, a 

 color, but is caused by the total ab- 

 sence of (R) and can be genetically 

 represented as (r). 



The Iowa Station^ gives results from 

 crossing a white Short-Horn bull on 

 pure-bred Galloway cows, with the fol- 

 lowing results : Twenty-seven blue-gray, 

 and one red-roan. The same bull on 

 grade Galloway cows produced twenty- 

 six blue-gray, one black (attributed to 



■■Jones and Eward, Iowa Research Bnllctin, Xo. 30. 



