124 



DAIRY CATTLE AND MILK PRODUCTION 



two groups averaged 144.5 pounds of fat. In this case the 

 additional fat produced by the best cows cost only 5.6 cents 

 a pound. 



The best Jersey cow in the University of Missouri herd aver- 

 aged 9,289 pounds milk and 437 pounds of butter fat for five 

 years, as compared with an average of 2,503 pounds of milk 

 and 122 pounds of butter fat for 3 years by the most inferior. 

 The best Holstein averaged 15,525 pounds of milk for five years, 

 in contrast to 5,681 pounds for three years by the poorest. 



The data below are from the records of the Iowa Experiment 



Station. 1 



TABLE 5 



FROM FOUR YEARS' RECORDS OF THE IOWA EXPERIMENT 

 STATION 



Data prepared by the writer but not published. 



