FORTY-THIRD ANNUAL CONVENTION 219 



3. The scrub heifers developed at the station averaged 

 13% more milk and 12% more fat than did the scrub cows 

 that came to the station when four years old or over. 



4. The daughters of all except one purebred bull have 

 proved to be much better producers, as two and three-year-olds, 

 than their dams as mature cows. However, this cannot be con- 

 sidered a breed comparison for the reasons brought out in the 

 discussion of table IV. 



5. The average of all the records made by first genera- 

 tion heifers by a purebred Holstein sire show an increase of 

 2314.5 pounds, or 71%, in milk and 67.15 pounds, or 42%, in 

 fat, at an average age of 3^ years, over the record of their 

 scrub dams at an average age of six years. 



6. The average record of the one first generation Jersey 

 grade that has freshened is 205.6 pounds, or 6%, more milk and 

 32.9 pounds, or 20%, more fat at an average age of 2^ years 

 than the record of her scrub dam at an average age of seven 

 years. 



7. The greatest increase shown by any of the first gen- 

 eration grades is that of No. 175 by the second Guernsey bull 

 used. This heifer as a 2-year-old produced 3451.0 pounds, or 

 131%, more milk and 179.22 pounds, or 136%, more fat than 

 the average record of her scrub dam reared at the station. How- 

 ever, the average records at an average age of three years made 

 by the first generation grades by the first Guernsey sire used, 

 are not quite equal to those of their mature dams. 



8. Variation in the ability of sires to transmit dairy quali- 

 ties is a factor to be considered in selecting a purebred bull to 

 head a scrub or common herd as well as for a high grade or pure- 

 bred herd. 



9. In persistency of milk production the grades were inter- 

 mediate between the scrub and the purebred cows in the herd. 



10. The first generation grades are much superior to their 

 dams in dairy conformation. 



