66 



Pork Production 



conditions. According to the data reported earlier, a 

 mature pregnant sow, weighing on the average 350 pounds 

 in the middle of the winter, may be fed to gain 90 pounds 

 diu-ing the 126 days on a daily ration, approximately, 

 of 3.75 poimds of concentrates, mostly corn, and 1.65 

 pounds of alfalfa hay. (See page 61.) For a gain of 

 75 pounds, 3.50 pounds of concentrates and 1.50 pounds 

 of fine quality alfalfa hay would probably be sufficient. 

 According to the Scandinavian feed unit system,^ 1.50 

 pounds of alfalfa hay is equivalent in feed value to .75 

 pound of concentrates like corn, wheat, shorts, or linseed- 

 oil meal. Reducing the hay to terms of grain, or feed 

 units, the daily ration would be 4.25 feed units for a sow 

 averaging 350 pounds. Charging at the rates of 1 cent 

 to 2| cents for each feed unit, or pound of concentrates, 

 the cost would be as represented in Table X. 



Table X. — Average Cost op Feeding 101 Mature Preg- 

 nant Sows During the Winter 



' Henry and Morrison : " Feeds and Feeding." A feed unit 

 is a pound of concentrated feed. One pound of com, 1 pound 

 of shorts or middlings, 1 pound of Unseed-oil meal, or 1 pound 

 of tankage, etc., is equal to one feed unit ; while 1.4 pounds of 

 bran, 1.1 pounds oats, 6 pounds of skim-milk, 12 pounds of whey, 

 or 2 pounds of alfalfa are equivalent to one feed unit. 



