HOW INDIVIDUAL SELECTION IS MADE 



151 



expressed by 100, and the yield for other periods of lactation 

 expressed by per cents. For example, in Period 1, at the 

 age of two years, 37 cows averaged 71 pounds of fat for each 

 100 they produced in the fourth milking period; and in the 

 seventh period 10 cows averaged 98 pounds of fat for each 

 100 the same cows produced in the fourth period. 



Table 9 is compiled from the Records of Official Testing 

 by the four leading dairy breeds. The Holstein figures rep- 

 resent the seven-day tests recorded for the year ending June, 

 1909. The figures for the other breeds include all yearly 

 records available to the writer at the time the compilation 

 was made. 



This table gives the number of cows of each age included, 

 the fat record expressed in per cent, counting that produced 

 at five years or above as 100, and the requirements for entry 

 to the various Advanced Registries at different ages expressed 

 in per cents, with the requirement for full age as 100. 



TABLE 9 



OFFICIAL TESTS 



YIELD FAT EXPRESSED IN PER CENTS, COMPARISON WITH RULES 



