72 Report of Depaktmext of Animal, Husbandry of the 



Under 2 is the average from 80 individual records for one month 

 with rations having a fuel value considerably higher than 30,000 

 Cal., and supplying considerably more than 15.5 lbs. of total 

 digestible organic matter. 



Table B. — Averages from Records for One Month. 



1 



Average age of cows, years 4 



Average live weight per cow, pounds 894 



Average month of lactation 6.2 



Average gain in live weight for month, pounds 12 



Fuel value of ration per KKX) lbs. live weiglit, Gal 28,855 



Total digestible organic nutrients per 1000 lbs. live 



weight poiuids 14.6 



Digestible protein per 100 lbs. live weight, pounds. .. . 2.1 



Nutritive ratio 1 :6 . 6 



Milk yield, average per day per cow, pounds 20.2 



Total solids in milk, average per day per cow, pounds 2.8 



Percentage of fat in milk 4.4 



Digestible dry matter in food for one pound of milk 



solids produced, pounds 4.6 4.8 



As the great mass of individual data is of no general interest, 

 only the averages from different groupings are given. The cost 

 of production is usually stated. While the more nitrogenous 

 foods, especially grain foods, are usually higher priced, the lib- 

 eral use of such foods as alfalfa forage, oat-and-pea forage, 

 clover hay, etc., has somewhat modified this relation. The cost 

 relation is an uncertain and fluctuating one, of course, but the 

 prices assumed for calculation would fairly represent the aver- 

 age cost of foods supplying rations of the stated composition. 

 Hay was rated at -$10 per ton, and corn stover at |5, silage and 

 roots were rated at |3, green fodders at |2. Corn meal, wheat 

 middlings and brewers' grains were rated at $20 per ton, wheat 

 bran, malt sprouts and gluten feed at .$18, ground oats, gluten 

 meal and new process linseed meal at $25, old process linseed 

 meal at |27, cottonseed meal at |30, and ground flaxseed, but 

 little used, $60 per ton. The average food cost of milk for all 

 the records considered was 73 cents per 100 lbs. 



