Studies in Milk Secretion 147 



to make them entirely island bred. On the dam's side of the 

 pedigree eleven are of strict island breeding. The average 

 number of ancestors on the sire's side of the pedigree is 8.82 

 and on the dam's side of the pedigree 7.04. The percentages 

 of the total number of possible island bred ancestors on the 

 sire's side of the pedigree are 58.8 and on the dam's side 46.9. 

 These figures show that the pedigrees of these twenty- 

 eight superior bulls have slightly over one-half island ancestry. 

 The two methods of classification show that there are more 

 bulls of island pedigree than cows in the breeding of these 

 sires and that more island bred animals of either sex are found 

 on the sire's side of the pedigree than on the dam's side of the 

 pedigree. 



The last four columns of table 10 deal with the percentages 

 which these island-bred great-great-grand parents form of the 

 total great-great-grand parents of their class. This informa- 

 tion is classified into the same groups that the previous infor- 

 mation for the whole pedigree was classified. These figures 

 show that of the possible male great-great-grand parents 58.5 

 per cent were island bred. Of the female great-great-grand 

 parents there were 55.8 per cent island bred. The males and 

 females of the fourth generation were more than half island 

 bred, the males having more of island breeding than the females. 

 The information was also classified into percentage of 

 island breeding on sire's side and on the dam's side of the 

 fourth generation of the pedigree. The number of island bred 

 great-great-grandparents on the sire's side constitute 63.8 per 

 cent of the total number. On the dam's side 50.4 per cent of 

 the total number were island bred. The great-great-grand- 

 parents on the sire's side of the pedigree have consequently 

 more island bred individuals than do the great-great grand- 

 parents on the dam's side of the pedigree. 



Entirely similar information for the inferior sires may 

 now be considered. This information is collected in table 11. 

 The arrangement of this table is entirely similar to- that of the 

 preceding table, No. 10. The methods of deriving the figures 

 are discussed in connection with that table. 



The figures given for the sires St. Helier of Sheomet, Fi- 

 nancial Raleigh, Mona Rose's Glory, Noble Peer, Pogis 94th 

 of Hood Farm, Island Lodestar, Eminent 10th, Imp. King of 



