236 FARMING ON FACTORY LINES 



The basal ration (No. 3) contains: 



Digestible Starch 

 Protein Eqtiiv. 

 3-26 lbs. 15-14 

 and 4 lbs. of maize meal in addition gives . *28 3-36 



Totals . . 3-54 - 18-5 



The starch equivalent of the ration is near enough 

 for practical purposes, but the digestible protein is 

 deficient to the extent of about | lb. If, however, we 

 substitute 2 lbs. of linseed cake in place of 2 lbs. of 

 the maize meal, we get a ration — Ration 3 — with a 

 starch equivalent of 18.3 and containing 3.9 digestible 

 protein which is near enough to the standard. 



Another method by which the feeding value and 

 protein contents of the ration could be increased, 

 without purchasing foreign feeding stuffs, would be 

 by substituting more vetch or clover hay in place of an 

 equal weight of meadow hay, and using home-grown 

 grain as concentrates. Example: — 



Total . . 3-98 18-55 



To take a further illustration of the "comparative 

 principle/' it is recommended in the Board of Agri- 

 culture leaflet, No. 79, to feed a 2 gallons per day cow 

 on the following daily ration : — 



