PRINCIPLES OF FEEDING POULTRY 



tract, is called the nutritive ratio. The fat has a feed value 

 two and a fourth times as great as the nitrogen free ex- 

 tract so the fat is multiplied by 2 J4 and added to the nitro- 

 gen free extract and the total of these two products, di- 

 vided by the protein, gives the last figure of the nutritive 

 ratio. The following example of a complete ration is 

 given to show how this nutritive ratio is figured. In this 

 example the scratch mixture and the mash have been com- 

 bined on the basis that the same number of pounds (300) 

 of scratch mixture are fed as of mash. The mash as 

 given in this ration totals 300 pounds to equal the 300 

 pounds of scratch feed (corn, wheat and oats), making a 

 complete balanced ration. Table ( II ) gives the number of 

 pounds of digestible feed constituents (protein, nitrogen- 

 free extract, and fat) in 100 pounds of each of the grains, 

 so that in order to get the number of pounds of these 



Table III 



Example of Nutritive Ratio 



45 



