juiy as, 19x8 Composition and Digestibility of Sudan-Grass Hay 183 
A comparison of the work done at this station with that done at the 
Maryland station shows that the coefficients of digestibility obtained 
agree fairly closely for most of the nutrients present in Sudan-grass hay 
(Table XIII). 
Table XIII.— Comparison of digestion trials with Sudan-grass hay 
Constituent. 
Digestion coefficients (6). 
Maryland. 
Iowa. 
Average. 
Dry matter.. 
Per cent . 
6o. 6 
35-4 
$ 3-3 
67.1 
41. 2 
Per cent. 
64.9 
47-4 
67.8 
70. 6 
5 8 *4 
Per cent. 
6 3-5 
43-4 
66. 3 
69.4 
52.7 
Protein. 
Nitrogen-free extract... 
Crude fiber. 
Ether extract. 
The Iowa results are in all cases higher than those obtained at the 
Maryland station, but only in the case of the crude protein and ether 
extract is there a very marked difference. This may, perhaps, be due to 
differences in the conditions under which the hays were grown, though 
they are very similar in composition, or more probably to variations in 
the digestive powers of the animals used. Whatever the factors or factor 
are that bring about this difference they apparently are selective in their 
action. 
The total and digestible nutrients in 100 pounds of Sudan-grass hay 
are given in Table XIV. 
Table XIV.— Nutrients in ioo pounds of Sudan-grass hay 
Constituent. 
Nutrients. 
Total. 
Digestible. 
Dry matter. 
Pounds. 
91. 6 
7*7 
4 & 3 
30-9 
1.8 
Pounds. 
58.2 
3-3 
32.0 
21.4 
•9 
Protein.'. 
Nitrogen-free extract. 
Crude fiber. 
Ether extract.. 
A comparison of Sudan-grass hay with timothy and millet hay shows 
that these feeds are very similar in composition. The digestible nutrients 
in 100 pounds of dry matter of the various feeds (Table XV) have been 
calculated from Henry and Morrison's tables (2), while the digestible 
true protein and net energy value of 100 pounds of dry matter have been 
obtained from Armsby’s work (j). 
57667°—18 - 3 
