﻿COST OF MILK PRODUCTION ON WISCONSIN FARMS. 5 



cows, the quantity of the milk produced and its quality, were com- 

 puted according to the Armsby feeding standard (see Table 2). The 

 net energy values of the average quantities used of the different feeds 

 were then computed. The feed contribution of pasture was computed 

 as the difference between the net energy required and the net energy 

 supplied by the feeds supplementing pasture during the 6 months 

 from May 1 to November 1. This calculation assumes that the cows 

 maintained approximately the same body weight during the year, 

 which, however, is not strictly true. On this basis, pasture supplied 

 nearly one-fourth of the estimated feed requirements of the cows 

 and somewhat less than that proportion of the total net energy sup- 

 plied during the year. 



Table 2. — Feed consumption per co%o and per 100 pounds of milk produced on 

 48 Wisconsin farms, 1920, together with the computed net energy values of 

 this feed. 1 





Group A. 



Group B. 



Group C. 



Group D. 



Group E. 



All farms. 





12 

 9,820 



8 

 6,940 



11 

 6,700 



8 

 6,290 



9 

 5,570 



48 



Average production per cow, pounds 



7,320 



ANNUAL FEED CONSUMPTION, PER COW (IN ADDITION TO PASTURE). 



Grain, pounds 



Hay, pounds 



Silage, etc., pounds 

 Fodder, pounds 



2, 987 



7,914 



1,854 



1,484 



1,056 



2,045 



2,581 



2,743 



2,358 



2,372 



8,496 



7,993 



7,640 



9,140 



3,948 



852 



124 



448 



1,527 



393 



1,990 



2,430 



7,591 



595 



NET ENERGY VALUES OF FEED SUPPLIED PER COW. 



Estimated requirement (year total), therms 



Reported fed, therms 



Pasture supplied, therms 



Total provided, therms 



Per cent of total requiredsuppliedbypasture 



4,850 



4, 576 



859 



4,085 

 3,618 

 1,248 



4,304 



3,870 



961 



3,772 



3,849 



914 



3,949 

 2,375 

 1, 574 



5,435 

 17.7 



4,866 

 30.6 



■ 4,831 

 22.3 



4,763 

 24.2 



3,949 

 40.0 



4,490 

 3.750 

 1,053 



4,803 

 23.5 



FEED SUPPLIED (IN ADDITION TO PASTURE) PER 103 POUNDS MILK. 



Grain, pounds 



Hay, pounds 



Silage, etc., pounds 

 Fodder, pounds 



30.4 



27.6 



27.7 



23.6 



19.0 



20.8 



37.2 



40.9 



37.5 



42.6 



86.5 



110.1 



119.3 



145.4 



71.4 



8.7 



1.8 



6.7 



24.3 



7.0 



27.2 



33.2 



103.7 



8.1 



VARIATIONS OBSERVED IN RATE OF FEEDING GRAIN. 



In quantity of grain fed per cow: 



Largest, pounds 



Smallest, pounds 



In grain fed per 100 pounds milk; 



Highest, pounds 



Lowest, pounds 



5,4.54 

 1,265 



43.5 

 16.7 



2,614 

 1,144 



39.6 

 21.1 



3,053 

 735 



45.2 

 12.0 



3,146 

 763 



34.3 

 14.3 



1,807 

 209 



2S.5 

 5.9 



5, 454 

 209 



45.2 

 5.9 



1 The net energy values and standard requirements used in the computations for this and other tables 

 in this bulletin are those published in "Feeds and Feeding," edition previously referred to. In his book, 

 "Nutrition of farm animals" (1917), Dr. H. P. Armsby discuss&s the whole problem of feeding cows in 

 minute detail, making a revision of the standard net energy requirements for milk production of approxi- 

 mately 10 per cent less than the figure used in these computations, based on the earlier tables. As these older 

 tables are probably much more generally available to farm readers through "Feeds and Feeding," and 

 Professor Eckles's book, "Dairy Cattle and Milk Production," and his research bulletins published by th9 

 Missouri Agricultural Experiment Station, the computations have been made on that basis rather than 

 according to the modified standard. 



