222 FOOD REQUIRED [chap. 



which have to be replaced by maize and decorticated 

 cotton cake. Four pounds barley meal will supply 2-96 lb. 

 starch equivalent and 0-36 lb. digestible protein ; i lb. 

 pea meal will add 070 lb. starch equivalent and 0-17 lb. 

 protein : total, 37 lb. starch and 0-53 lb. protein. Four 

 pounds maize will supply 3-36 starch and 0-28 protein, 

 to which \ lb. of cotton cake will add 0-35 of starch and 

 0-17 protein, making a total of 371 lb. starch 

 equivalent and 0-45 digestible protein. The protein is 

 a little lower in this ration than in that which it was 

 intended to replace, but the albuminoid ratio is still 

 narrow enough for pigs that have made a good deal of 

 growth and are chiefly putting on fat. Another ounce 

 or two of cotton cake and a little less maize would make 

 the ration almost exactly equivalent to the old one. 



Such are the uses to which the following tables can 

 be put by a practical farmer. In Table XXII I. are given 

 certain standard rations which have been worked out by 

 Kellner from the results of a very large number of 

 exact experiments ; from these he may learn the weight 

 of starch equivalent and protein that is appropriate to 

 various farm animals. By the aid of Table XVII. the 

 farmer can calculate the starch equivalents and digestible 

 protein in the rations he is using, and correct them if 

 they depart widely from the quantities given by 

 Kellner. Finally, if, to suit the fluctuations of the 

 market or the materials available on the farm, he 

 wishes to modify his current ration, he can from this 

 same table calculate the quantities of other foods 

 necessary to replace those to which he has hitherto 

 been accustomed. 



