166 CONTINUOUS CROPPING 



In the case of a cow yielding, say, 4 gals, of milk per 

 day, it would not, as may be supposed, be sufficient to 

 increase the quantities of each of the foods contained 

 in Ration 2, in order to supply additional nourish- 

 ment. So doing would make the ration too bulky. 



In practice, 2 st. or 28 lbs. of dry fodder is about as 

 much as a cow can consume, especiall}^ when 5 or 6 st. 

 of green fodder is also being fed. It may also be 

 mentioned that fed on green fodder alone a cow will 

 consume up to 9 or 10 st. per day. 



We may look upon No. 2 as a basal ration, and for 

 a cow yielding over 3 gals, of milk per day (or even 

 2 1 gals, if the cow is in poor condition) obtain the 

 higher starch equivalent required, and the extra 

 digestible protein by feeding concentrated food. 



A useful rule to follow would be to allow about 



2 lbs. of concentrates for every | gal. of milk over the 



3 gals, standard, or over 2 J gals, if the cow is in poor 

 condition. 



According to the table a 4-gal. cow would require 

 a daily ration equivalent to 18 lbs. of starch and con- 

 taining 4 lbs. of digestible protein. 



The question arises what concentrates should be 

 used to bring the basal or No. 2 ration up to this 

 standard ? The basal ration contains : — 



Totals . . . 3-33 18-48 



The starch equivalent of the ration is near enough 

 for practical purposes, but the digestible protein is 

 deficient to the extent of a Uttle over J lb. If, however, 

 we substitute 2 lbs. of earth-nut cake in place of 2 lbs. 

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



