142 



Agricultural Chemistry. 



In the following table are assembled a few examples of the 

 starch equivalents of feeds for both maintenance and production, 

 as formulated by Kellner. 



Comparative Value of Ordinary Feeds for Oxen and Sheep. 



Kellner admits that our knowledge of the actual productive 

 value of feeds is still very incomplete. Such values have been 

 determined by actual experiments in only a few cases and then 

 only for the mature fattening ox. It serves, however, to illus- 

 trate the trend of experimentation and the serious and laborious 

 attempts being made to place the nutritive value of feeding stuffs 

 on a scientific experimental basis. It appears from the above 

 table that approximately 2 pounds of oat or wheat straw may 

 replace 1 pound of corn, if the ox or sheep is merely on a main- 

 tenance diet, but that 1 pound of corn will have as great an effect 

 as 4 pounds of oat straw or 10 pounds of wheat straw when the 

 animal must grow or fatten. 



Kellner's feeding standards. The first table on the following 

 page is a brief summary of these standards. 



Armsby's feeding standards. As an outgrowth of tho work 

 of Kellner and continued work with the respiration calorimeter, 

 Armbsy has begun to formulate feeding standards, giving the net 

 productive energy of feeding stuffs. These are expressed in 



