Studies in Milk Secretion 141 



mitting qualities of his sons for "milk production but raised 

 their butter-fat percentage. The net loss in butter-fat was 

 15.85 pounds for each daughter sired by a son of Hood Farm 

 Pogis 9th. The poorest bull in the list was Mabel's Raleigh 

 whose sons caused a net loss in their daughter in milk produc- 

 tion, butter-fat percentage and butter-fat. Channel King's and 

 Valentine's Oonan's sons cause a loss of butter-fat of 3798 

 and 40.75 pounds respectively in their daughters as compared 

 with their dams. 



Jersey Sires which Decreased the Milk Production, 



Butter-Fat Percentage and Butter-Fat of Their 



Daughters. 



If the same reasoning is followed as that in the previous 

 section of the paper, the inferior bull is the bull which lowers 

 the milk production, butter-fat percentage and butter-fat of 

 his daughters as compared with their dams. Tables 4, 5 and 

 6 allow the determination of bulls which were inferior accord- 

 ing to these standards. These bulls are shown in table 9. 



There are 47 of these inferior sires as measured by the 

 standard of what their progeny did. There are consequently 

 in the Jersey breed nearly twice as many bulls who lowered the 

 production of their daughters as there are bulls who raised the 

 milk production and butter-fat percentage of their daughters. 

 This fact can well be viewed with alarm. It brings home more 

 forcefully than has yet been done the need for exact knowledge 

 of the mode of inheritance of milk and butter-fat production. 

 The Maine Agricultural Experiment Station recognizes the 

 need for this information and has a project under way to at- 

 tempt to obtain the facts (1). 



This list of sires, inferior in their transmitting qualities, 

 is arranged according to the number of pounds of net butter- 

 fat that their daughters' butter-fat production was less than 

 their dams' butter-fat production. The sire which caused his 

 daughters to drop farthest below their dams was the first bull 

 in the list, Gertie's Son of Washington. The sire which caused 

 his daughters to drop least was Prince Noel. Considering the 

 number of daughter-dam pairs the sires, Hood Farm Torono 



