310 ILLINOIS DAIRYMEN'S ASSOCIATION. 



Best 10 cows tested 388.75 lb. butter fat. 



Poorest 10 cows tested 109.42 lb. butter fat. 



Average all cows tested 226.62 butter fat. 



Average poorest herd 142.05 butter fat. 



84.57 butter fat. 



Best 10 cows tested 388.75 butter fat. 



Average poorest herd 142.05 butter fat. 



246.70 butter fat. 



Cows in Illinois 995,429 



25 per cent improved 248,857 



Unimproved 746,572 



746,572 x 84.57 lbs 63,137,594.04 lbs 



63,137,594.04 lbs. at 25 cents $15,784,398.51 



746,572 x 246.7 lbs 184,179,312.4 lbs. 



184,179,312,4 lbs. at 25 cents $46,044,828.00 



The material in Table 27 has been arranged to aid the reader 

 in contrasting the different degrees of production, and to show 

 as clearly as possible the ease with which the producers of dairy 

 products may realize a larger return for their efforts. The differ- 

 ence between the average production of the poorest herd and 

 that of the best herd is 208.1 pounds butter fat a year. This differ- 

 ence is 146.5 per cent of the average production of butter fat in 

 the poorest herd. The difference between the production of the 

 poorest herd and an average herd, is 85.26 pounds butter fat per 

 cow or 60 per cent of that in the poorest herd. It is interesting 

 to note that the best 10 cows have an average annual record of 

 388.75 pounds of butter fat five of them belonging to one herd. 

 The poorest 10 cows have an average record of 109.42 pounds 

 butter fat, six of them being members of the same herd. The 

 average annual production of all cows tested is 226.62 pounds 

 butter fat, an amount 84.57 pounds greater than the average pro- 

 duction of the poorest herd. In this connection, it should be 

 borne in mind that the average yield of butter fat for a dairy cow 



