Compounding of Rations 121 



multiplied by 2% before adding to the carbohy- 

 drates, as explained above. The nutritive ratio 

 is found by dividing the carbohydrates, plus 2X 

 times the fat, by the protein. In the accompany- 

 ing table. No. II, the sum of the carbohydrates 

 and fat, thus obtained, is given in the third 

 column, which, divided by the protein as given 

 in the second column, gives the second term of 

 the nutritive ratio in the fifth column. 



A feeding stuff having a large proportion of 

 carbohydrates and fat as compared to protein, is 

 said to have a "wide" nutritive ratio, whereas one 

 having a small proportion of carbohydrates and 

 fat as compared to protein has a "narrow" ratio. 

 While these terms are relative, it may be said 

 that a ratio greater than 1:6 is wide, while one less 

 than 1:5 is narrow. The composition of feeding 

 stuffs, that is, the proportion in which the different 

 nutrients occur, is determined by chemical analy- 

 sis, but the amount of each nutrient that is actu- 

 ally digestible has been determined by careful 

 experiments with living animals. Only the diges- 

 tible nutrients are considered in the tables given 

 in this publication. 



b. Feeding Standards. — The amount of nutri- 

 ents required and the proportions in which each 

 should be given, vary with the kind of animal 

 and the purpose for which it is kept, — whether it 

 is gi'owing, being fattened, doing work, or pro- 



