iv Preface. 



German author Kiihn in his popular work on the same topic. In 

 the successful management of live stock abstract knowledge can- 

 not take the place of experience, though it will prove of the 

 highest value when both are rightly combined. The stockman 

 who in addition to experience possesses some knowledge of the 

 composition of the nutrients of feeding stuffs, and has considered 

 how the animal grows and is nourished by them, is certainly 

 thereby better equipped for wisely and economically administer- 

 ing feed to the animals under his care. And in the deeper in- 

 sight and wider range of vision which these studies insure, there 

 comes keener enjoyment and a greater satisfaction to the posses- 

 sor, in his daily round of duties. 



Acknowledgment is due my co-worker. Prof. F. W. Woll, for 

 assistance, especially in collating the data published by foreign 

 investigators. His familiarity with this source of information 

 has been of the highest utility. Mr. A. M. Troyer, a graduate 

 student in agriculture, has assisted in preparing and verifying 

 the tables from American sources. 



W. A. Henry. 



Madison, Wis., February, 1898. 



