PREFACE. 



For more than a generation past many of the ablest scientists 

 of the Old World have devoted their energies to a study of 

 the laws of animal nutrition. American Experiment Stations, 

 although of recent origin, have added much to our store of 

 knowledge concerning the application of science to stock feed- 

 ing. From these fruitful sources the writer has endeavored to 

 select data important in establishing principles and helpful in 

 directing rational practice. In addition there has been gathered 

 from all available sources the experiences and observations of 

 stockmen. 



Much space is occupied by tables, which are usually condensed 

 and arranged from the original sources, to which references are 

 made. By their help it is hoped the student will be able to 

 determine for himself to what extent the deductions drawn are 

 warranted by the facts. Moreover, the data they contain may 

 form the basis for new studies with those specially interested, 

 and may make additional conclusions possible. 



The stockman whose training has been solely in the school of 

 experience often holds in light regard that which is written con- 

 cerning his vocation. Let him remember that facts and truths 

 are the same whether their repository is a book or the human 

 mind. Held by the latter, all perish with the possessor; in the 

 keeping of the former, the whole world may be benefited. On 

 the other hand, novices usually underestimate the importance of 

 experience, often thinking that by reading they can acquire the 

 knowledge necessary in the prosecution of their business. That 

 stock feeding is an art and not a science, and that experience and 

 judgment must rule in its successful conduct, is recognized in 

 this volume by placing on the title page the adage, "The eye of 

 the master fattens his cattle." In this we have followed the 



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