1578 The Cornell Reading-Courses 



must contain 24 pounds or more of dry matter (see footnote to table), 



in which, for the maintenance of her body, this cow will require .700 



pound of protein and 7.925 pounds of total nutriment. In addition to 



maintenance, she will require .0624 pound protein and .3312 pound total 



nutriment for the production of one pound of milk testing 3.7 per cent 



fat; for 30 pounds of milk she would require 30 times these amounts. 



Her total requirements will be as follows: 



Total 

 Protein nutriment 



For maintenance . 700 7-925 



For 30 pounds of milk, 3.7 per cent fat 1 . 872 9 . 936 



Total 2.572 17.861 



17.861 (pounds of total nutriment) — 2.572 (pounds of protein) = 15.289 

 (pounds of carbohydrates + [25 x fat]). 15.289 -v- 2.572 (pounds of 

 protein) = 5.9. Therefore the nutritive ratio of the required ration 

 must be not wider than 1 : 5.9. The protein in the ration must total not 

 less than 2.572 pounds, and there must be digestible protein, fiber, nitro- 

 gen-free extract, and fat multiplied by 2|, to total 17.861 pounds. 



A combination of foods suitable for a dairy cow, in sufficient quantity 

 to yield total nutriment and protein in the above amounts, must now be 

 found. It will be assumed that at the price at which a farmer can buy 

 his foods or raise them, he will find that red clover hay, corn silage, 

 corn and cob meal, gluten feed, and cottonseed meal will yield him his 

 total nutriment the cheapest. 



A cow will eat in twenty-four hours, when fed the right proportion of 

 roughage and concentrates, about one pound of hay and three pounds 

 of corn silage to each one hundred pounds of live weight. In order to 

 meet the requirements of the feeding standard when fed the above amount 

 of roughage, she will need about one pound of grain to three pounds of 

 milk. 



In order to have the nutritive ratio 1:5.9 i n the ration, about equal 

 parts of grains below twenty per cent digestible protein and of grains 

 above twenty per cent digestible protein will be found necessary. In 

 the ration suggested above, corn and cob meal has been chosen for the 

 grain below twenty per cent digestible protein, and gluten feed and cotton- 

 seed meal have been chosen for the grains above twenty per cent digestible 

 protein. If it were necessary to have a narrower nutritive ratio, more 

 foods having a high protein content would be included; if a wider ration 

 were desired, more carbohydrate foods would be used. Calculating in 

 detail from Table 1, the amounts of dry matter, digestible nutrients, 



