FEEDING DAIRY CATTLE 241 
Dry matter ci ase: cases poe vases: tnsawe 24.15 pounds. 
Digestible protein ...............00005- 2.15 pounds. 
Digestible carbohydrates and fat ........ 14.5 pounds. 
Nutritive ratio 0.0... 0... cece eee eee eee 1:69 
Feeding Table for Dairy Cows.—While not formulated as a 
standard, Professor Humphrey and the author, in 1911, published 
a table showing at a glance the quantities of dry matter anid di- 
gestible components required daily by dairy cows of 800 to 1500 
pounds body weight, and producing from less than one-half pound 
to over two pounds butter fat per day.*® This table is based chiefly 
on the results obtained in investigations with the dairy herd of 
the Wisconsin station for a period of nine years. 
The figures for 1000-pound cows are shown in the table: 
Feed Requirements for 1000-pound Dairy Cows Producing 0.6 to 2.0 Pounds 
Butter Fat Per Day, in Pounds 
Dry | Digestible | ,,2°ta! 
jaathet protein digencbis 
Dairy cows (maintenance)..............-..- 12.5 70 7.9 
Production of butter fat per day: 
Less than 0.5 pound ................... 16.2 1.18 10.6 
0.5 to 0.75 pound.................00058. 18.7 1.49 12.3 
0.75 to 1.0 pound...................2.. 21.1 1.80 14.1 
1.0 to 1.25 pounds..................... 23.6 2.11 15.8 
1.25 to 1.5 pounds...................-. 26.0 2.43 17.6 - 
1.5 to 1.75 pounds..............-.-+--- 28.5 2.74 19.3 
1.75 to 2.0 pounds..........-.-.-+-+0-- 30.9 3.05 |. 21.1 
The composition of a certain co:nbination of feeds may be 
readily compared with the requirements of cows of different body 
weight and productive capacities, as shown in this table, and 
tations thus formulated which will contain approximately the 
amounts of dry matter and digestible protein required for a cer- 
tain production of butter fat. The corresponding amounts of 
digestible carbohydrates and fat may be readily found by subtract- 
ing the amount of digestible protein from that of total digestible 
matter, and the nutritive ratio by dividing this difference by the 
amount of digestible protein. 
Example: A 1000-pound cow producing 1.3’ pounds butter fat per we ; 
was fed as follows: 10 pounds alfalfa hay, 25 pounds corn silage, 10 pounds 
of a-grain ‘mixture composed of corn, oats, and wheat middlings, in the 
proportion of 2: 2:1. This ration contains the amounts of:total digestible 
matter and energy values as given below, on the supposition that the, feeds 
are of average composition and digestibility. 
*® Wisconsin Bulletin 200; see also Woll, Handbook, p. 196. 
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