362 H. FUNKQUIST 



No. 110 has six. half-brothers and sisters fallen from no. 4J:0> one 

 with P-colour, four M-colour, and one K-colour. 



No. 500 has a half-sister from the mother's side ^Yith 7v-colour. 



No. 416 has a half-sister from the mother's side with /v-colour. 



The genealogical table is thus seen to be very heterogeneous. 



This explains why the Ç-calf no. 125 got a brother, no. 181 (April 2, 



1919), with iV-colour, although both parents had the P-colour. It 



is possible that no. 125 is a homozygote as regards the muzzle colour 



and, therefore, a good breeding animal. If the P-coloured muzzle is 



to be bred pure, only such animals should be selected the genealogical 



tables of which include animals with the most pigmented muzzles. 



If the /T-coloured muzzle is wanted, animals whose parents have 



had the P-muzzle should be selected. The following scheme shows 



such a case. 



cf-calf, born ^\ \ 1918 



muzzle colour A' 



'^ no. 110 '. 2 no. 760 



muzzle colour P muzzle colour P 



^ no. 100 Ç no. 515 (^ no. 100 $ no. 512 



muzzle colour P muzzle colour /T muzzle colour P muzzle colour P 



This c^-calf is a homozygote with regard to the muzzle colour, 

 while the calf in the following genealogical table may be a heterozy- 

 gote. 



^-caU, born ^'/, 1915 

 muzzle colour Ä 



cj" no. 110 $ no. 511 



muzzle colour K muzzle colour K 



The present study has also shown that the inheritance of the 

 muzzle colour in Swedish red and whites is not to be regarded as 

 sex linked. 



ZoHN (4) and other investigators are of the opinion that also 

 climate, food, age etc. are factors in the development of the pigment. 

 Such modifications, however, do not seem to be of any importance 

 V ith regard to the inheritance of the muzzle colour in the Stjern- 

 sund breed. 



