318 



ILLINOIS DAIRYMEN'S ASSOCIATION. 



of carbohydrates and fat can take the place of protein in the least 

 degree. 



Digestible Nutrients. 



The digestibility of the different constituents of feeds is of 

 great importance, as only that portion of feeding stuffs which 

 passes into solution during the process of digestion and is ab- 

 sorbed into the blood is of value in nourishing the animal. This 

 portion of the various feeds is known as the digestible nutrients. 



The difference between the total nutrients and the total di- 

 gestible nutrients is marked : for example, by referring to feed- 

 ing tables we find that in 100 pounds of clover hay are digestible 

 and can be used to nourish the animal. The digestible nutrients 

 are, therefore, the only ones considered in making up rations. 



Table 1. 



Digestible Nutrients Required Per Day for a 1000-Pound Cow for 



Maintenance and Following Yields. 



Carbohy- 



Protein, drates, Fat, Nutritive 



It). lb. It). ratio. 



For maintenance 7 7. .1 1: 10.3 



10 lb. milk 3% fat 1.10 8.81 .24 1: 8.3 



10 lb. milk 4% fat 1.17 9.16 .26 1: 8.4 



10 lb. milk 5% fat 1.24 9.51 .29 1: 8.2 



20 lb. milk 3% fat 1.49 10.62 .37 1 



20 lb. milk 4% fat 1.63 11.32 .42 1 



20 lb. milk 5% fat 1.77 12.02 .47 1 



7.7 

 7.5 

 7.4 



30 lb. milk .3% fat 1.89 12.43 .51 1 



30 lb. milk 4% fat 2.10 13.48 .58 1 



30 lb. milk 5% fat 2.31 14.53 .66 1 



7.2 

 7.1 

 7.0 



40 lb. milk 3% fat 2.29 14.24 .64 1 



40 lb. milk 4% fat 2.57 15.64 .74 1 



40 lb. milk 5% fat 2.85 17.04 .84 1 



6.9 



6.8 

 6.7 



50 lb. 



milk 3% fat 



50 lb. 



milk 4% fat 



50 lb. 



milk 5% fat 



2.68 

 3.03 

 3.38 



16.05 

 17.80 

 19.55 



.78 



.90 



1.03 



6.7 

 6.6 

 6.5 



60 lb. milk 3% fat, 

 60 lb. milk 4% fat, 

 60 lb. milk 5% fat 



3.08 

 3.50 

 3.92 



17.86 

 19.96 

 22.06 



.92 

 1.07 

 1.22 



Q.5 

 6.4 

 6.3 



