THREE-QUARTER BLOOD JERSEY NO. 348 OUT OF HALF-BLOOD JERSEY NO. 241 
This cow’s average production is 5366.9 pounds of milk and 278.7 pounds of fat. “The scrub cows 
were mated to purebred sires of the Holstein, Guernsey and Jersey breeds, and the heifer calves 
resulting from such matings were maintained under the same conditions as the other animals. 
The heifers by purebred sires were bred to other purebred sires of the same breed, and the heifer 
calves resulting from such matings were also kept for dairy purposes.” (Fig. 9.) 
calculated to the mature basis in 
accordance with a scale obtained from 
a study of 10,000 records. 
TaBLe J|.—Percentage of Mature Production 
Expected of Immature Heifers 
Age % 
Garis arytensin hele Sierceleishore reise quate 70 
Mw O-VEAt~ Old Sir. wayne bee cat = coe. 80 
MMAKEE-VCAT“OlGS «caves nate feseuere ate abe ahs 'ons 85 
Out V.Car-OldS Wine c. craw sii ten arcade 95 
The factors studied in this investi- 
gation are of a very varied character 
and it is necessary that the material 
relative to each factor be considered 
separately. 
INFLUENCE OF ENVIRONMENT 
Of the scrubs that were brought to 
the station a few were not of producing 
age, while of those that had reached 
producing age two were four years old 
TaBLE II: Production of Cows That Were Four Years Old on Arrival at the Station 
Average Production Increase in Production 
Lactation Age Milk Fat Actual Expected 
No. Years Ibs, Ibs. 
Milk Fat Milk Fat 
% % % % 
1 + 3084.6 149.24 
2 5 3984.4 178.97 29 19 5 4 
3 6 4618.1 217.79 50 46 oe} 6 
4 7 4907.7 229.91 59 54 10: 8 
5 8 4224.0 197.59 37 32 12 9 
6 9 1991.3 84.76 —35 —43 10 7 
7 10 2862.5 133.70 —7 , —10 9 5 
8 11 2296.2 93.83 —26 —36 5 1 
