
A STUDY OF RATIONS FED TO MILCH COWS. 59 
The coefficients of digestibility used here are given in the 
following table. They are practically the same as those used 
in previous reports. They are based upon the results of 
digestion experiments with domestic animals. Where such 
experiments have been made in this country, in sufficient 
number to give reliable results, these are used for the coefficients. 
In other cases the results of European (and especially German ) 
experiments have been drawn upon for the purpose. 
Coefficients of digestibility employed in calculating the digestible 
nutrients in the different feeding stuffs used 
in these rations. 








CARBOHYDRATES, 
KIND. Protein. Fat. Nitrogen- 
free Fiber. 
f Extract. 
fo % % % 
Wheat bran,~ - - - - : 7h TOs yas 337 
Linseed meal, - - = 5 : 86+ got 8ot 50+ 
Cotton seed meal, " 2 : : 89* 100* 68* 357 
Wheat middlings, - : - - 79" 85* 83% B37 
Corn meal, - - - - - 76+ g2t 87+ 58t 
Gluten meal, - = - - - Sy" 88* ropes oat 
Good quality hay, - - : é bA* 54* 63" 5a 
Poor quality hay, - - - - 45* A5=e i. Goe 46* 
Clover hay, : + - é - Gis 49* 65" 46* 
Oat hay, - : : - : . aa 61 coe Ase 
Corn stalks (stover), - . . 5a" Bon 64* 66* 
Potatoes, - a - : . 44* tee git — 



* From results of American digestion experiments. 
+ From results of German digestion experiments. 
In order to show the range of variation from day to day in 
the feeding of the same herd, the minimum and maximum 
daily rations per 1,000 pounds live weight and per average 
weight of each herd are appended in the tables. The size of 
the ration is here measured by the fuel value of the digestible 
nutrients (protein, fat, etc.). A ration which has a large fuel 
value may have a small amount of a given kind of food ora 
given kind of nutrients. Hence it sometimes happens that the 
minimum of one of the nutrients furnished by a certain kind 
of feeding stuff in a given ration may be greater than the 
average of the nutrients in that ration. The same may happen 
conversely, in the case of the maximum. 
e 
