SELECTION AND IMPROVEMENT OF DAIRY CATTLE 45 



FIG. 7. An example of wide variation in production. These cows 

 are registered Jerseys and half sisters. The one above averaged 418 

 pounds of fat for the first three years in milk. With the same treatment 

 the one below averaged 109 pounds of fat for the same three years. The 

 variation in the production was due to inherited characteristics. 



