40 



FEEDS AND FEEDING 



a class the roughages are high in fiber, and therefore much less digestible 

 than the concentrates. This will be noted on comparing the digestion 

 coefficients for timothy hay and oat straw with those for corn and wheat. 

 The dry matter of mangels is as well digested as that of wheat, again 

 showing that roots are more like concentrates than roughages. 



69. Digestible nutrients in feeding stuffs. To determine the digestible 

 nutrients in any feeding stuff the total amount of each nutrient in 100 

 Ibs. of the feed is multiplied by the digestion coefficient for that nutrient. 

 For example, 100 Ibs. of dent corn contains 10.1 Ibs. of crude protein 

 (Appendix Table I), of which 74 per ct. is digestible, as shown by the 

 preceding table. Accordingly, there are 7.5 Ibs. of digestible protein in 

 100 Ibs. of this grain. By this method the data contained in the exten- 

 sive Table III of the Appendix have been computed. The following 

 examples are here taken from this table for illustration and study. 



Digestible nutrients in 100 Ibs. of typical feeding stuffs, from Appendix 



Table III 



"The high value for flax seed is due to the fact that its 29.0 Ibs. of digestible 

 fat equals 65 Ibs. of digestible carbohydrates (29.0x2.25=65.2). 



In Appendix Tables I and II the fiber and nitrogen-free extract are 

 given in separate columns, for, tho of the same chemical composition, 

 these components usually differ widely in digestibility. In preparing the 

 tables showing the digestible nutrients in feeding stuffs, the digestible 

 fiber and digestible nitrogen-free extract are determined separately and 

 the results combined under the term carbohydrates, as is done in this 

 table. The digestible carbohydrates in dent corn are computed as fol- 

 lows: According to Appendix Table I, 100 Ibs. of dent corn contains 

 2.0 Ibs. of fiber, 57 per ct. of which is digestible, as shown in Appendix 



