VALUATION OF FEEDING STUFFS 231 



straws. These sub-groups are broadly distinguished by the 

 difference in the amount of protein. 



(3) The more widely scattered group of concentrated 

 foods, all of which contain either more than 12 per cent, of 

 digestible protein, or more than 50 per cent, of digestible 

 non-nitrogenous nutrients. In this division also several 

 sub-groups of foods, of more or less similar composition, can 

 be made out as follows : 



(a) Very highly concentrated substances with a nutritive 

 ratio of less than 2 to r, including earthnut cake, soya 

 cake, decorticated cotton cake, and gluten meal. 



(b) Concentrated foods with a N-ratio of from 2 to i 

 to about 4 to i. This group might be arbitrarily divided 

 into one including soybeans, linseed cake, rape cake, and 

 gluten feed, and another including beans, peas, dried grains, 

 malt dust, cocoanut cake, palmnut cake, and the two varieties 

 of undecorticated cotton cake. 



(c) The cereal grains, wheat, barley, rye, oats, and their 

 products, pollards, sharps and bran, and maize and rice meal. 

 All these have a N-ratio of about 6 to i or less. 



The pure oils, e.g. codliver oil, linseed, locust beans, and 

 molasses all lie outside the natural groups mentioned above. 



It will be seen, therefore, that these natural groups 

 correspond with the ordinary agricultural classification of feed- 

 ing stuffs. This may be rendered as follows : 



CLASSIFICATION OF FEEDING STUFFS. 

 I. Succulent and watery foods. 



1. Roots and tubers. 



2. Herbaceous (green) fodders grasses, clovers, vetches, cabbages, 



silage, etc. 

 II. Coarse, bulky dry fodders. 



1. Hays. 



2. Leguminous straws. 



3. Cereal straws, chaff, husks, etc. 

 III. Concentrated foods. 



1. Seeds ceVeals, pulse, and oily seeds. 



2. Oil cakes, compound cakes, and meals. 



3. Commercial by-products, e.g. from milling, brewing, starch, and 



sugar industries. 

 IV. Animal products, e.g. meat meals, milk, etc. 



