MATS"ITAL OF CATTLE-FJEEDING. 355 



For hogs, whej is a very palatable and excellent fodder, 

 eBpecially if its very wateiy cons^ibtence be reduced some- 

 what by the addition of grain. Indeed, many feeding-stuffs, 

 like bran or oats, which of themselves are less adapted to 

 these animals, seem to be better utilized when thus fed 

 with whey than when used alone. 



Far more nutritious than whey are skimmed milk and 

 sour milk, the first ha\ing lost chiefly fat and the second 

 notlnng. They have a luirrow nutritive ratio, and with 

 their help lai'ge quantities of potatoes and other feeding- 

 stuftfo poor in protein can be very completely digested and 

 ULiii^eci* 



All the constituents of milk may be regarded as wholly 

 and easily digestible, except, perhaps, when it forms the 

 exclusive food, when small quantities njiay escape digestion 

 or resorption. 



§ 0. TUBEKS ANB RoOTS. 



GiDNCRAL PjiOPFBTiFS.— The fcodiufi^-stuffs which we 

 liave hitherto considered in this chapter either have a 

 medium nutritive ratio, or contain an excess of protein. 

 Tubers and roots, on the other hand, contain an excess of 

 the non-nitrogenouB nutrients, starch predoniinating in the 

 former, and sugar and pectin in the latter. As we regai'ded 

 Other feeding-stuffs as concentrated because tliey contained 

 in a small bulk large quantities of digestible protein, so we 

 may call these also concentrated, because they contain, in a 

 small bulk, large quantities of digestible carbhydrates. 



Of the tubers, the one of greatest importance is the 

 potato. It is a thickened underground stem, in which 

 large quantities of starch have l)een laid up to serve as 

 food for the new bratichcs, leaves, and fruit which are to 

 develop from it. In like manner, the loots (turnips, beets, 



