SFar 



PREFACE 



Feeds and Feeding, first published in March, 1898, was received with 

 immediate and widespread favor by practical stockmen, as well as by the 

 professors and students of animal husbandry in our agricultural colleges 

 and secondary schools. The plan of the book had been laid along origi- 

 nal lines, and neither labor nor expense was spared in its preparation. 

 In 1910, after nine editions had come from the press, the book was entire- 

 ly rewritten and improved in many ways. Again in 1915 the book was 

 completely rewritten and enlarged to include the recent information, 

 both scientific and practical. To this revision Professor Morrison, who 

 had assisted thruout the first revision and who now became joint author, 

 devoted much time, with a corps of trained assistants, during a period 

 of over two years. The favor with which this second revision was re- 

 ceived exhausted two large editions in less than two years and nine 

 printings of the last edition have been required in rapid succession. 



During the past few years exceedingly important discoveries have been 

 made concerning the science and practice of live stock feeding. Further- 

 more, economic conditions have radically changed. Therefore, Professor 

 Morrison has again entirely rewritten the book to include the latest 

 information and to adapt it to the changed economic conditions since 

 the World War. Just as in the previous revision, the results of many 

 important investigations, completed so recently as not yet to be in print, 

 have been furnished by scientists thruout the country, in order that 

 the findings might be presented in this revision. 



It is the aim to give in Feeds and Feeding an unbiased and condensed 

 presentation of the most important findings of the investigators of both 

 the Old and New Worlds in the science of animal nutrition, together 

 with the most important results of the vast number of feeding trials 

 which have been conducted at the experiment stations in the United 

 States and other countries, the whole being iv '.ruled out by the practical 

 experiences of many of the leading stockmen of America. The authors 

 have not relied merely on a thoro study of the published information on 

 nutrition and stock feeding, but have gained personal contact with con- 

 ditions in various districts by extensive travel. 



Part I presents briefly the fundamental principles of animal nutrition, 

 including the most recent discoveries of the scientists. The bearing of 

 these principles upon the practical feeding of live stock is given especial 

 emphasis. Particular attention is given to the newer discoveries in nu- 

 trition, including the functions and importance of vitamines and mineral 

 matter, as well as the differences in the quality of food proteins from 

 various sources. 



48120:: 



