It is fitting that the first book of the series Should deal with what' is probably, the most important source of income of American farmers, dairy farming. As population increases we must of necessity depend more on dairy products and less on beef cattle. The best methods of producing beef are very different from the best methods of producing milk. Many farmers who once kept beef cattle are changing to dairying. For such farmers a study of dairying is of particular importance because it will bring to them in formation that has been worked Out by long experience in dairy regions. Even in the old established dairy regions the changes in prices of land, feed, labor, and dairy products and the increasing importance of manure for growing cash crops, make a study of the principles of dairy farming of prime importance.
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