36 DAIRY CATTLE AND MILK PRODUCTION 



This association was the first to adopt the Babcock test 

 as their official method which was done in 1894. At first the 

 plan was adopted of printing the records in the form of butter 

 calculated on the basis of 80 per cent fat. Since this overrun 

 is higher than is ordinarily secured in making butter, this 

 method was criticized severely until, in 1903, the rules were 

 changed. At the present the supervisor of the test reports 

 the milk and fat yield only. If it is desired to express the 

 result on the basis of estimated butter, one sixth should be 

 added to the fat. In examining a Holstein pedigree it 

 should be observed whether the records are given in butter 

 fat or butter, and if the latter, upon what basis it is estimated. 

 The majority of the Holstein breeders still use the 80 per cent 

 basis in giving the records of butter production by their cows. 

 The majority of the tests are for seven days, but they may be 

 for any longer period. Breeders are encouraged to test again 

 after eight months. The tests are conducted by the ex- 

 periment station in the state where the cow is located. If 

 the cow reaches certain requirements, she is given a number 

 and entered in the Advanced Registry. She is afterwards 

 commonly referred to as an A. R. O. cow. 



The minimum requirements for admission are the follow- 

 ing : 



2-year-old 7.2 pounds fat in 7 days 



3-year-old 8.8 pounds fat in 7 days 



4-year-old 10.4 pounds fat in 7 days 



5-year-old 12.0 pounds fat in 7 days 



Every day of increased age at date of calving increases the 

 requirement .00439 pounds of fat until five years is reached. 

 After a cow is entered in the Advanced Register on a seven- 

 day test she is eligible to a year's test. The owner keeps 

 the daily records of milk produced, and the product for two 



