520 Bulletin 169. 



the number of pounds of milk given during the week is taken 

 to represent the number of pounds of fat produced during that 

 week. Although this method does not give the actual amount 

 -of fat produced, still it giv^es a very close approximation thereto 

 and is sufficiently accurate for practical purposes in estimating 

 the producing power of any individual cow. 



The records given in the following table (I) begin with 

 September 1891 and continue until the fall of 1898 and are for 

 all the cows which have been in the herd during that time. 

 These records contain the cow's age, breed, date of calving, the 

 number of the lactation period, the number ot weeks in the 

 period, the total milk produced, the average per cent of fat 

 and the total fat for the period. The breed of each cow is 

 indicated by the initials following her name. J., designating 

 Jersey, H., Holstein, T., Thoroughbred, G., Grade, and J.-H., 

 Jersey-Holstein. 



