HOW INDIVIDUAL SELECTION IS MADE 



149 



milk, and the question at once arises as to what she can be 

 expected to do when mature. The following data and dis- 

 cussion are based upon a study made by the author of the 

 complete records of a Jersey herd covering 15 years, and of 

 a Holstein herd for 10 years. To this is added a table com- 

 piled from the published official records of the four leading 

 dairy breeds. 



It must be understood first of all that the figures given are 

 averages, and that some individual animals will vary widely 

 from the average. The data will, however, give a fairly 

 good index of what may be expected, as it may be reasonably 

 assumed that the majority will follow near the average. 



Table 7 is compiled from the records of the herd owned 

 by the University of Missouri. These figures are nearly 

 all from Jersey cows. It has been the custom in this herd 



TABLE 7 



EFFECT OF AGE ON THE QUANTITY AND QUALITY OF MILK. 

 UNIVERSITY OF MISSOURI HERD 



