STOCK FEEDING. 



9 



definite bulk. Where the ration contains a great deal of rich 

 concentrates in proportion to roughage, it is apt to lack in 

 bulk. On the other hands, a ration containing a large propor- 

 tion of corn stover, oat straw and similar roughage, is likely to 

 make the ration so bulky as to make it impossible for a heavy 

 producer to consume enough of it to obtain the required nutri- 

 ents. 



In the ration calculated on pages 7 and 8, the proportion of 

 roughage and concentrates is about right. Under average con- 

 ditions a cow yielding 22 pounds of milk should have a ration 

 composed of about two-thirds roughage and one-third concen- 

 trates. For greater yields it is best, as a rule, to increase only 

 the concentrates to meet the requirements of the additional flow 

 of milk, thus making the proportion of concentrates to rough- 

 age greater the larger the yield of milk. 



FERTILIZING CONSTITUENTS OF FEEDS. These are nitrogen, 

 phosphoric acid, and potash. Feeds rich in these constituents 

 will produce manure correspondingly rich in them. In the 

 selection of feeds, therefore, some attention should be given 

 to their manurial value, especially since feeds differ so widely 

 in this respect. 



An illustration of the extent to which feeds differ in their 

 fertilizing or manurial constituents is given in the following 

 table, which shows the amount of nitrogen, phosphoric acid and 

 potash contained in corn and cotton seed meal. The table also 

 shows the value of these constituents, which was obtained by 

 rating the nitrogen at 15 cents per pound, and the phosphoric 

 acid and potash at 4 1-2 cents per pound. 



TABLE 4. Showing fertilizing constituents in corn and cot- 

 ton seed meal. 



The table shows that the fertilizing value of a ton of cotton 

 seed meal exceeds that of a ton of corn by $17.30, an amount 



