are easily and cheai)ly ])r()duced ujx)!! the farm, and l)eeause the 

 digestive traet of the boxine is es})eeially suited to utilize them. 

 Most of these home-grown coarse feeds, however, are wry high in 

 earbohvdrates and have a relatively low digestibility. It is neces- 

 sary, theiefore, to suj)})lement them to an extent with the cereal 

 grains, which, though relatively low in protein, are very digestible; 

 and with the concentrated l)y-])r()ducts, M'liich, in addition to a rela- 

 tively high digestibility, are (juite rich in protein. A single illustra- 

 tion will make this clear. Many exi)eriments have demonstrated 

 that a l,(X)0-pound cow, })rodu('ing daily 10 (piarts of milk of 

 average cjuality, needs ap})roximately the following amounts of 

 digestible nutrients : — 



Now, if this animal were fed daily as much of an extra (juality 

 of hay as she would consume (28 to 30 pounds), she would re- 

 ceive : — 



Digestible. Protein. Fat. Carbohydrates. Total. Nutritive Ratio. 



Pounds, . . 1.8 .3 13 14.6 1 to 10.5 



Such a ration is deticient both in total diwstible nutrients as well 

 as in digestible protein. If 7 })ounds of the hay Avere rei)laced 

 by an equal amount of corn meal, the hay and corn meal would 

 furnish : — 



The corn meal being very digestil)le, but a one-sided or starch}'- 

 feed, would sufficiently increase tlie total digestible nutrients, but 

 not the })rotein. Tf 4 })ounds of corn meal were re})laced by 2 

 pounds of bran and 2 })ounds of cotton-seed meal, the several feeds 

 would suppl}^ : — 



Digestible. Protein. Fat. Carbohydrates. Total. Nutritive Ratio, 



Poiuids, . 2.07 .60 13.20 15.87 1 to 6.6 



The replacing of 7 pounds of hay with o i)()unds of <orn meal 

 rich in digestible matter and with 2 pounds each of bran and cotton- 

 seed nu'al especially rich in digestible protein, furnishes a ration 



