44 



Journal of Agricultural Research 



Vol. XV, No. 1 



Pigmented is dominant to unpigmented tongue. Lakeland's Poet 

 seems to contradict this but a study of his pedigree given above shows 

 him heterozygous for the unpigmented tongue. 



Inheritance op Switch Color 



All of the crosses available for study in this experiment have either 

 one or both of the parents with a black switch. It is impossible, there- 

 fore, to determine the dominance of the other colors to each other. Black 

 as a color is dominant to the other colors (Table XXV). 



Table XXV. — Behavior of the switch color in the parental and first filial generations 



Sire. 



Taurus Creamelle Henger- 

 veld. 



Do 



Do. 



Do. 



Kayan . 



Do 



Do 



Lakeland's Poet. 

 Do 



Minor crosses: 

 Crossbred o. 



Do. 

 Do. 

 Do. 



Description of mating. 



White Xblack. 

 White X white. 



White Xblack, few gray 



hairs. 



WhiteXFi white 



Black, few white hairs X 



black. 

 Black, few white hairs X 



white. 

 Black, few white hairs X 



mixed red, black, gray. 

 BlackX white 



Crossbred lo 



Lady Primrose's Governor 



of the Fountain. 

 Johanna Lad Manor De Kol . 

 Columbia's Fox 



Black Xblack, few white 

 hairs. 



Black carrying white X 



black. 

 Black carrying white X 



black carrying white. 

 Black carrying white X 



black and white. 

 Black carrying white X 



white, 

 do. 

 White Xblack, few white 



hairs. 

 White Xbrown. 

 Black Xblack, few white 



hairs. 



Offspring. 



1 black, 2 white, 2 black 

 and white. 



2 white, I white with few 

 black hairs. 



2 white, I white tip and i 

 black. 



2 white. 

 5 black. 



ID black, I blackXwhite. 



3 black. 



I black, I blackXwhite, i 



black, few white hairs. 

 3 black. 



2 black. 



I white. 



Do. 



I black. 



I red. 

 I black. 



I black and white. 

 I black. 



The apparent exceptions to this conclusion are shown by their pedigrees 

 and their other breeding records to be heterozygous for the white factor. 



Two interesting cases of segregation appear in the Fj generation. A 

 white switch resulted from mating Crossbred o (black carrying white) 

 to an Fj cow (black carrying white). Another case of segregation of 

 perhaps more interest than the above is that from Crossbred lo (black 

 carrying white X white). This mating gave an orange-red — that is, the 

 ground color of the Guernsey minus its diluting factor has been substi- 

 tuted for the white of the parent. 



