Studies in Milk Secretion 113 



of class B daughters. Spermfield's 'Owl was bred to 20 per 

 cent class A cows. From these he produced 12 per cent class 

 A daughters, 4 class B daughters and 4 class C daughters. In 

 this particular Hood Farm Torono maintained the production 

 of his daughters better than Spermfield Owl. Hood Farm 

 Torono was bred to 15 per cent of dams in class B. From these 

 he produced 9 per cent class A daughters, 3 per cent class B 

 and 3 per cent class C. Spermfield Owl was bred to 38 per 

 cent class B dams. From these he produced 23 per cent class 

 A, 12 class B and 4 class C daughters. In their abilities to 

 raise the production of the class B cows the bulls are conse- 

 quently of about equal merit. Hood Farm Torono was bred 

 to 41 per cent class C dams. From these he produced 32 per 

 cent class A daughters and 9 per cent class B. Spermfield Owl 

 was bred to 20 per cent class C dams. From these he produced 

 8 class A daughters, 8 class B and 4 class D. Hood Farm 

 Torono is better able to raise the production of the class C 

 dams than is Spermfield Owl. Of the class D dams Hood Farm 

 Torono is bred to 15. The progeny from this mating were 9 

 in class A, 3 in class B and 3 in- class C. Spermfield Owl was 

 bred to 24 class D cows. The offspring of this mating were 

 12 in class A, 4 in class B and 8 in class D. Hood Farm 

 Torono consequently raised the milk production of his daugh- 

 ters from D dams more than did Spermfield Owl. 



The examination of the milk transmitting qualities of the 

 poorest bull in this group of native sires, Hector Marigold, 

 shows that this bull lowered the milk production of his daugh- 

 ters from both class A and class B dams. 



As above pointed out the bull of merit in the imported list 

 is Royal Majesty. Royal Majesty maintained the production 

 of the class A cows to which he was mated in their offspring. 

 He raised the production of the other classes of cows to which 

 he was mated. The poorest performance of the imported bulls, 

 The Imported Jap, lowered the production of his daughters 

 over that of their dams in all but one case. 



This table may also be used to determine the worth of a 

 sire through the production of his sons. . Thus Eminent has 

 six sons in this table. These sons have a total of 24 daughter- 

 dam pairs, four of these sons raise the milk production of their 

 daughters over that of their dams and two lower the produc- 



