360 



H. FUNKQUIST 



coloured ones, or about 143. However, the nuin])or of the P-calves 

 amounts to 251. This is due to the fact that the bulls nos. 100 and 

 117 gave only P-calves. Moreover, it appears very probable that 45 

 7*-cows are homozygotes at least with regard to one intensity factor. 

 This assumption is strengthened by data on the inheritance of muzzle 

 colour in P-cows listed in table Xlll. 



The results of the crosses between P-bulls and .IZ-cows, and 

 between M_bulls and P-cows give also support to the view that the 

 i1/-animals as a rule belong to the genotypes ggppPiPi or ggPppjh^ 

 This point is illustrated in the following scheme. 



4P:3M:1/^ 



My material has given the following results : 123 P : 93 M : 32 A'. 

 These numbers show a very good correspondence with the luunbers^ 

 just given. More so when it is remembered that a few of the iV-animals 

 may have a genotypical constitution differing from the one assumed 

 in the above. 



Provided that M belongs to the genotypes ggPppipi or ggppP\P\ 

 the cross My^M would give 1 P:2 M : \ K. In my material of 

 il/-animals the numbers are : 17 P : 22 .1/ : 18 K. The number of 

 iV-calves is too small. I have mentioned already that some of the 

 M-cows probably have another constitution than the ones just mentio- 

 ned, and this may be the cause of the deficient number of M-calves. 

 The number of the individuals has also been too small. 



Also the results of the crosses P X ^v, M X A', A X P, A X ^l '^nd 

 A X A' give support to the working hypothesis here adopted, which 

 warrants its use in future experiments. 



As to the possibilities of a genetical analysis of a cattle breed 

 interbred at random, it should be said, that the great difficulties to 

 overcome were realized already before the starting of the work. If 

 was undertaken in order to gain starting-points for future experiments. 



The result of my study shows, however, that the inheritance of the 



