EXPERIMENT STATION BULLETINS. 



265 



not be far from 13 pounds of the former and from .75 to 1 pound of 

 fat. The silage and clover hay together contain but 15.82 pounds of 

 dry matter, the lacking 8.18 pounds must be derived from some other 

 material. There is also a lack of 1.235 pounds of the protein. Of the 

 grain feeds and by-products, wheat bran furnishes digestible nutrients 

 at the smallest cost. Moreover, a reference to table 1 discloses the 

 fact that while 10 pounds of bran will furnish more than the needed 

 amount of dry matter, namely, 8.8 pounds, it will supply also the 

 needed protein, 1.26 pounds. We can then make a new table, thus: 



Ration 1. 



Cost. 



In silage and hay 



Wheat bran, 10 pounds. 



Total 



$0.0738 

 .0425 



$0.1163 



This ration, costing eleven and a half cents, or slightly more, per 

 day per cow, contains enough both of dry matter and protein, but is 

 somewhat deficient in carbohydrates. 



To compare with this ration, let us make up one, using the corn 

 and oats already on the farm, that we may know whether it is wise 

 to sell any of this grain to buy bran. Using the silage and clover 

 hay as before, let us first form a ration in which five pounds of a 

 mixture of equal parts by weight of corn and oats ground together is 

 substituted for five pounds of bran. The ration will then stand like 

 this : 



Ration 2. 



Silage and hay... 



Corn and oats, 5 ponnds. 

 Wheat bran, 5 pounds... 



Total 



Cost. 



$0.0738 

 .0344 

 .0213 



$0.1295 



In obtaining the cost of the corn and oats in this instance one 

 eighth of the cost of the original grains is added for grinding. 



This ration costs 1.32 cents per cow per day more than the former 

 one. It does not necessarily follow, however, that it should not be 

 used. The distance from market and from the mill would have to be 

 considered. If the grinding can be done by a windmill or a cheap 

 power on the farm it may pay better to use the corn and oats than 

 to sell them and buy bran at the. prices assumed. In the silage there 

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