242 PRODUCTIVE FEEDING OF FARM ANIMALS 
Composition of Ration for Dairy Cows, in Pounds 
Digestible 
Dry Digestible | Energy 
matter ‘ Carbohy- true values, 
Protein drates protein therms 
and fat 
10 pounds alfalfa hay... 9.2 1.10 4.2 .69 3 
25 pounds corn silage. . . 6.6 : 4.5 : 4.14 
4 pounds oats......... 3.6 37 2.3 .33 2.65 
4 pounds corn......... 3.6 3.1 3.55 
2 pounds wheat mid- 
i 1.8 1.2 
25 .26 
Totall.isi ceed | 24.8 2.34 15.3 1.77 
According to the Armsby standard modified by Eckles, this cow, if pro- 
ducing, say, 30 pounds of milk testing 4.03 per cent, should receive: 
Digestible Energy 
protein, value, 
pounds therms 
For maintenance .............0cce ee eeee 5 6.0 
POF PFOMUGHIONy 6.2 acsielgee ease ae eee eed ete 1.62 8.6 
Dotal!: ys ceves oe sicwagiccne wee a wtie yess 2.12 14.6 
The cow did not, therefore, receive as much protein or as many therms 
of energy values in the ratio given as called for by the standard; but the 
difference is very likely apparent rather than real, since it will be found, on 
examination, that the digestible true protein in alfalfa hay, according to the 
table, is very low, and probably lower than the actual content in average 
alfalfa hay, which contains 1.10 per cent digestible crude protein. 
By the use of the table (p. 241) we find that the cow should receive 26 
pounds dry matter, 2.4 pounds digestible protein, and 15.2 pounds digestible 
non-nitrogenous components. These amounts agree closely with the cal- 
culated composition of the ration, showing that this would furnish an 
ample supply of nutrients for a 1000-pound cow producing about 1.3 pounds 
butter fat a day. According to the Haecker standard,” the cow would be en- 
titled to the following amounts of nutrients: 
Digestible Carbohy- 
protein, drates and 
pounds fat, pounds 
For maintenance .............0.0ee0eee -70 7.3 
For production ................02 0000 1.62 8.7 
Total .otageris. cade anew erate ie 2.32 16.0 
Also, in this case, there is a close agreement between the standard and 
the composition of the ration calculated according to the average composition 
of the various feeding stuffs. 
Feeding the Dairy Heifer.—The practice of good dairy farmers 
as to the time of breeding heifers differs considerably. The best 
results may, however, be expected by breeding so that the heifer 
1 Minnesota Bulletin 130. 
