302 



BULLETIN 39. 



TABLK I. — SHOWING THE AVERAGE YIELD OF MILK AND BUT- 

 TER FAT PER COW, WITH GROSS CASH RETURNS FOR 

 THE SAME, IN FIFTY-EIGHT ARIZONA HERDS. 



An examination of the above table reveals the fact that of 

 the fifty-eight herds reported, sixteen failed to pay what we have 

 estimated to be the cost of keeping. The difference between the 

 return of the average cow of the poorest herd and the average 

 cow of the best herd is the difference between a loss of $18.22 and 

 a profit of $22.80. 



