U AT TLB 203 



2. If .051 lbs. of protein, .25 lbs. of carbohydrates and .018 lbs. 

 !)i fat are required to produce 1 lb. of 4^^% milk, how many pounds of 

 each nutrient are required to produce 18 lbs. of 43^% milk? 



3. How much protein, carbohydrates and fat will a 1,050-pound 

 cow giving 18 lbs. of 43^% milk require? 



TO COMPOUND A RATION 



Proportion of Grain to Roughage. — When one knows 

 a cow's requirements it is a very simple matter, by using 

 the table on page 175, showing the composition of feeds, 

 to compound a ration that will supply them. 



We have found that an eleven hundred pound cow 

 giving 15 lbs. of 4% milk daily requires daily 1.49 lbs. of 

 protein, 11.15 lbs. of carbohydrates and .35 lbs. of fat. 

 A cow could not eat enough roughage to supply this amount 

 of nutrient. She must have some more concentrated feed 

 such as grain. Many dairymen feed grain in the proportion 

 of 1 lb. of grain to each 3 lbs. of milk that the cow gives, 

 and supply the rest of the nutrients required by feeding 

 roughage. This is practically a safe basis. Thus the cow, 

 whose record is given above, would require about 5 lbs. of 

 grain (as she gives 15 lbs. of milk daily) and roughage to 

 complete the ration. 



A Simple Ration. — To compound a ration one must 

 know the composition of various feeds to be fed. See 

 table, page 175. 

 Daily Ration for 1,100 Pound Cow Giving 15 Lbs. of 4% Milk Dally 



Pro C. H Fat 



Com, dent 3 lbs. .225 20.34 .138 



Bran, wheat 2 1b. .250 8.32 .060 



Clover hay, red 11 lbs. .836 4.323 .198 



Fodder com, medium dry 8 lbs. .240 3.784 .120 



Total nutrients 1.551 10.973 .516 



It wiU be seen that this ration contains approximately 

 the right amount of protein, for which no other nutrient 

 may be substituted, but is a little deficient in carbohydrates. 

 There is .17 lbs. more fat than is required, which may 

 be used to make up the shortage in carbohydrates. We have 

 learned that fat and carbohydrates are used for the same 

 purposes in the animal body, and that fat is worth 2.2 

 times as much as carbohydrates, hence the excess fat (.17x2.2) 

 is equal to .37 of a pound of carbohydrates; which, added 



