Oct. 7, 1918 Crosses between Dairy and Beef Breeds of Cattle 



23 



the Aberdeen-Angus was dominant. The red of the Hereford segre- 

 gated out in the Fj generation. Further, in his interesting crosses of 

 bison on domestic cattle, Boyd {10) shows that the bison on almost any 

 breed produced either black or brindle body color, indicating that here 

 also the dark body color was dominant. 



Early in the study of the inheritance of color in cattle Barrington 

 ana Pearson (6) collected data to show that red cattle sometimes resulted 

 from the cross of two black Galloways. This was used by them as an 

 argument against the Mendelian explanation. It remained for Lloyd- 

 Jones and Bward {20) on their own data and that of Youatt {59) to 

 show that this was no anomaly to the Mendelian explanation, but that 

 it was due to the grade Galloways being heterozygous for this red. In 

 some crosses of Shorthorns on Galloways they show that in the straight 

 F2 generation a clean-cut segregation of 20 blacks to 6 reds was obtained. 



Table VII. — Behavior of the general body color in the parental and first filial genera- 

 tions of cattle 



Sire. 



Taurus Creamelle Hen^erveld 



Do 



Do 



Kay an 



Do 



Do 



Lakeland's Poet. 

 Crossbred o Fj. .. 



Do. 



Crossbred 10 Fj 



Lady Primrose's Governor of 



the Fountain. 

 Delva's University De Kol . . 

 Johanna Lad Manor De Kol . . 

 Columbia's Fox 



Description of mating. 



carrvma 



Black X black 



Black X fawn 



Black X Fi black 

 fawn. 



Black X black 



Black X fawn 



Black X red 



Fawn X black 



Fj black carrying fawn X fawn 



Fi black carrying fawn X Fi 



black carr)ang fawn. 

 Fi black carrying fawn X fa\m 

 Fawn X black 



Black X fawn. 



....do 



Fawn X black. 



Ofispring. 



7 black. 



5 black. 



2 black. 



3 black. 

 15 black. 



4 black. 



6 black. 



I black, I dark fawn, 

 some black hair's 

 present. 



3 black. 



I deep red-fawn. 

 I black. 



Do. 

 Do. 

 Do. 



The F2 generation of our crosses contains two very interesting animals 

 as above mentioned : One, a deep-orange bull, was the result of a back- 

 crossed black Fj bull carrying the Guernsey color onto a Guernsey. 

 The other was produced by a back cross of a black Fj bull, Holstein- 

 Friesian X Jersey, onto a dark Jersey. The coat of this heifer was 

 very dark. The appearance of the dark-fawn and deep-orange offspring 

 from black F^ parents indicates that segregation of the parental coat 

 colors does occur. The deep-orange bull is of especial interest since he 

 shows the segregation of the Guernsey coat with the color modified. 

 This deepening of the shade of the coat seems to be confirmatory evi- 

 dence for the hypothesis advanced by Wright {58) that the coat color 

 of Guernsey cattle differs from the other dun-colored breeds by a reces- 



