THE COST OF FEED 1 7 



be suppKed by grain, which is about 1:6.5. Such a mixture 

 is supplied by the following ration: 



Protein. Energy. 



150 pounds corn or hominy 10.5 132 



100 pounds distillers' grains 22 79 



100 pounds bran 10 48 



100 poxmds oats 8 66 



450 So-S 32s 



This ration suppUes 50.5 pounds of protein and 325 therms 

 of energy. By dividing 454.51, the amount of protein needed, 

 by 50.5 we get the amount of this mixture needed for the year, 

 or nine. Expressed in another way, each cow of the size and 

 production indicated would require besides the hay and silage 

 9 times each of the different quantities of feeds used in the 

 above mixture. These feeds would not furnish the cheapest 

 ration at the present time, but are the ones commonly used 

 by the dairymen from whom Woll gathered his data. The 

 size and production of the cows assumed here are also the 

 avera.ges for the Guernseys in these studies, and the prices 

 here assumed are the same as those used by Woll. 



To summarize the feed cost, we have the following: 



1,680 pounds of hay at $0.80 per 100 $13.44 



7,000 pounds of silage at $0.15 per 100 10.50 



ii3S° pounds of corn at $1.00 per 100 i3-So 



900 pounds of distillers' grains at $1.50 per 100 13.50 



goo pounds of bran at $1.05 per 100 9.45 



900 pounds of oats at $1.10 per 100 9.90 



Pasture for season.at $5.00 5.00 



Total cost of feed for year $75.29 



The average cost of feed per year for 157 cows included in 

 the studies by Woll was for Guernsey cows of this class $70.95. 

 These cows averaged 8,500 pounds of milk, so the two results 

 difiEer by less than one-fifth cent per quart. Some of the 

 rations contained less distillers' grains, making a cheaper ra- 

 tion, and some cows got more than 20 per cent of their total 

 food from pasture, both of which tends to reduce the average 

 cost. Others got some stover and straw. 



This method requires considerable space for discussion, but 



