34 



SUCCESSFUL FARMING 



Concentrates are feeding-stuffs which contain a relatively large 

 amount of digestible nutrients and energy in a small bulk. They usually 

 are highly nutritious in nature. Concentrates usually have an energy 

 value of 60 or more therms per 100 pounds. Concentrates may be sub- 

 divided into nitrogenous and non-nitrogenous concentrates. 



A nitrogenous concentrate is one which is relatively rich in protein. 

 It usually contains 11 per cent or more of digestible protein. Common 

 examples are tankage, cottonseed meal, linseed meal, gluten feed, dried 

 distillers' grains, dried brewers' grains, soy beans, bran, middlings and 

 shorts. As a rule, but few nitrogenous concentrates are produced on the 



THE RESPIRATION CALORIMETER IN USE FOR AN EXPERIMENT. 1 



farm and therefore they must be purchased. Nitrogenous concentrates 

 are almost essential in the rations of all growing animals in order to furnish 

 protein and mineral matter so essential to the proper development of 

 muscle and bone. Likewise the milk cow requires nitrogenous concentrates 

 in order to provide the large amounts of protein and mineral matter which 

 she excretes in her milk. Fattening animals and work horses often need 

 small amounts of nitrogenous concentrates, especially if they are still 

 growing. 



A non-nitrogenous concentrate is low or only medium in protein con- 

 tent, but is usually rich in carbohydrates. It generally contains less than 



i Ycar-Book, U. S. Dept. of Agriculture, 1910. 



