402 



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 can not be consid- 

 ered a breed comparison for the reasons brought out in the dis- 

 cussion of table IV. 



5. The average of all the records made by first generation 

 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^/2 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 qualities 

 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 purebred 

 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. 



11. Many of the first generation grades show the characteris- 

 tic color of their sire 's breed ; however, in the case of the Hoi- 

 steins this was not so pronounced until the second generation. 



12. There was no appreciable difference between the scrub 

 and grade calves so far as coefficient of digestion is concerned, 

 but the grades had a greater capacity for handling concentrates 

 than had the scrubs. 



