104 Maine Agricultural Experiment Station. 1919. 



d means that the letters following refer to the pedigree of the 

 dam only. 



The analysis of the amount of American and Island an- 

 cestry is approached in these ways. Only the Island animals are 

 tabled as the number of the American animals of any desired 

 group may be obtained by difference. 



(i) The number of Island bulls and Island cows found 

 in the pedigree of the superior and of the inferior sires are 

 tabled separately, and recorded in absolute numbers and in per- 

 centage of the total ancestors. 



(2) The absolute number and percentage of island bred 

 animals occurring in the sire's or dam's side of the pedigree are 

 recorded. 



Besides this information a table is given to show what pro- 

 portion the Island ancestors are of the total great-great-grand- 

 parents of the superior and inferior sires. This information is 

 classified in the two ways indicated above. 



From these facts the relative influence of the island im- 

 ported stock can in some degree be determined for the supe- 

 rior and inferior sires of the Jersey Registry of Merit. 



The Transmitting Qualities of Jersey Sires for Milk 



Production. 



In table 4 is given all Registry of Merit Bulls with two 

 or more tested daughters coming from tested dams. These 

 bulls are arranged according to the number of pounds of milk 

 .that their daughter's yearly production was greater than their 

 dam's yearly production. This information is given in the fifth 

 column of the table. These bulls are given a number (shown 

 in the first column) running from the bull producing the great- 

 est average net increase in his daughter's milk production, 

 Queen's Raleigh, to the bull producing the greatest average net 

 decrease in his daughter's milk production, Hood Farm S. Tor- 

 mentor. In the second column is given the bull's name. In the 

 third column is given the registry number. The fourth column 

 contains the number of daughter-dam pairs on which the aver- 

 age net change of milk production is based. The last column 

 marks the quartile changes, records the relative position of the 



