DAIRYING 



47 



The relation between daily feed and production of butter fat, 

 as well as size of the cow, is approximately shown by the follow- 

 ing figures : 



A cow weighing 800 pounds when producing 1 pound butter 

 fat in her milk per day needs 21 pounds total dry matter, which 

 shall contain 14 pounds digestible dry matter and 2 pounds digesti- 

 ble protein in her feed per day. 



Taking the figures in the above table as standards, a calcula- 

 tion of the amount of feed needed for each cow may be made 

 when the amount of dry matter, etc., in the feeds available is 

 known. 



The following table gives the necessary figures for making 

 such a calculation with a few of the most common feeds. 



AVERAGE COMPOSITION OF SOME OF THE COMMON COXCKXTRATED 



STUFFS 



