434 



THE AMEBIC AX NATUBALIST [Vol. XLYI 



6, adult). (The brothers of these cows were not ob - 

 served.) The F 2 calves of this herd are from a Brahma 

 sire on these F x cows. My notes fail to show whether or 

 not the sire of the F 2 calves is the same as that of their 

 I\ mothers. The sire of the F 2 calves appears to be in- 

 termediate in color between the white and brown Brahma. 

 The calves are of two distinct types, about one-half of 

 them having the Brahma characters and the other half 

 bearing the characters of their hybrid mothers (Fig. 

 6, calves). In the figure (Fig. 6) a good type of the 

 hybrid resembling the mother is the sucking calf at the 

 right, while several apparently pure Brahmas are shown 

 in the foreground. 



Herd No. 3 



The F l cows of this herd are the progeny from a 

 Brahma sire on high grade Hereford cows. The F 2 

 calves and yearlings are from another Brahma sire on the 

 Brahma-Hereford hybrid. On counting these thirty-two 

 calves and yearlings, it was found that seventeen of them 

 resemble mostly the sire and grandsire Brahma while 

 fifteen come nearer to the type of the .hybrid mothers 

 (Fig. 7, calves and yearlings). 



Conclusions Concerning the Inheritance Behaviob 

 It appears that the color patterns of Herefords and 

 Durhams are dominant in the F x generation. However, 

 the hump, large sheath and dewlap of the Brahma show 

 slightly in the Brahma X Hereford or Durham F x 

 progeny. It is clear that in the F 2 generation, pure 

 Brahma and pure Durham are segregated. Indications 

 are that when the parent strains are pure the segregation 

 follows the simple law of alternative (Mendelian) in- 

 heritance. However, the conditions of the experiment, 

 the lack of full knowledge of the constitution of the 

 parents and the inadequate observations prevent any 

 positive conclusions as yet concerning the ratios. 



