Studies in Milk Secretion 



123 



bulls will be the subjects of special study in a succeeding sec- 

 tion of this paper. 



The Transmitting Qualities of Jersey Sires for Net 



Butter-Fat. 



The quantity of butter-fat produced is a function of the 

 two variables, amount of milk and percentage of fat in the 

 milk. Since this is so, the heading of the section could with 

 equal propriety be the net change in the butter-fat from mother 

 to daughter of the daughters of Jersey sires. 



The arrangement of the table to show this relation for 

 Jersey sires differs from the preceding tables in that the column 

 for the quartiles is omitted as being superfluous since these 

 data have been given in tables 4 and 5 for the two variables on 

 which the amount of butter-fat depends. The first column of 

 table 6 gives the place occupied by the bull in the series of 

 bulls. The second and third columns give the name and reg- 

 istry number of the bull. The fourth column states how many 

 pairs of daughter-dam tests the bull under discussion had. The 

 fifth column gives the number of pounds of butter-fat that the 

 bull's daughters are in excess or defect of their dams. It is 

 by this column that the bulls are arranged, the bull whose 

 daughters produced the most butter-fat over the butter-fat 

 production of their dams coming at the top of the list. The 

 plus sign shows the daughters produced more butter-fat than 

 their dams, the minus sign that they produced less butter- fat. 



TABLE 6. 



Bulls in Order of Change in Net Fat of Daughters. 







Registry- 



No. of 



Net Change 



No. 



Name of Bulls 



No. 



Pairs 





1 



Sans Aloi 



81012 



2 



+210.56 lbs. 



2 



Signal's Successor 



72758 



3 



+177.72 lbs. 



3 



Golden Glow's Chief 



61460 



4 



+161.93 lbs. 



4 



Hood Farm Pogis 34th 



63300 



2 



+159.24 lbs. 



5 



Tormentor's Landseer Signal 



69291 



4 



+153.55 lbs. 



6 



Clear Brook Chief 



74685 



2 



+153.31 lbs. 



7 



Channel King 



62762 



2 



+150.30 lbs. 



8 



Golden Nero 



62052 



2 



+149.77 lbs. 



9 



Majestic Fern 



84428 



3 



+143.97 lbs. 



10 



Roma's Rioter of St. L. 



70951 



3 



+143.79 lbs. 



11 



You'll Do Oxford 



98772 



2 



+136.61 lbs. 



