THR INHKRITANCE OF THE MUZZLK COI.Ol U 361 



muzzle colour is more complicated than is generally believed. That 

 it follows the MendeHan law of segregation seems certain. Gowen's 

 view that the pigmented muzzle is dominant to the non-pigmented 

 one in the Holstein — Friesian breed may be correct, provided that this 

 breed represents pure bred animals with regard to the black pigment. 

 Although not completed a study of the inheritance of the pigment in 

 Sw^edish black and whites closely related to the breed just mentioned 

 has shown it to be as complicated as in the breed of Stjernsund. 



Although already known the result of my investigation shows 

 clearly that the value of the genealogical tables in breeding work may 

 be doubtful. A good animal may be produced in spite of poor descent. 

 A seemingly beautiful genealogical table, on the other hand, does not 

 guarantee a good offspring. The following example may illustrate 

 this point. 



$-calf no. 125, born "/s 1918. 

 muzzle colour P 



IÎO. 95 '^ no. 440 

 luzzle muzzle, 

 olour ? colour M 



No. 118 does not have any brothers and sisters, but three half- 

 brothers and sisters fallen from no. 642 have all i\/-colour. 



No. 680 has a sister with P-colour and five half-brothers and 

 sisters fallen from no. 518, two with P-colour and three with A'-colour. 



No. 114 has a sister with P-colour. 



No. 642 has four brothers and sisters, two with P-colour and 

 tW'O with M-colour, and one half-brother fallen from no. 416 with 

 i\/-colour. 



No. 109 is a brother of No. 642. 



No. 518 has a sister with i\/-colour. 



