734 Starch Equivalents of Feeding Stuffs, [dec, 



The facility with which a ration can be judged can be 



seen from the following examples : — 



Digestible Starch 



protein. equivalent, 



lb. lb. 



70 lb. 01 swedes ... ... ... 0*21 5*25 



16 oat straw ... ... ... o'i6 272 



2 „ decort. cotton cake... ... 079 1*44 



i'i6 9*41 



Suppose this ration to be fed to a cow of 1,000 lb. live 

 weight giving 10 lb. of milk per day, then according to the 

 table of feeding standards she would be receiving sufficient 

 protein, and the starch equivalent would be ample. When 

 the cow was giving more milk, say, double the quantity, 

 then the digestible protein required would be from i*6 to 1*9, 

 and the starch equivalent would have to be from 9*8 to 11' 2. 

 According to Kellner's standards, a ration with more straw 

 and cake would be needed, e.g. : — 



Digestible Starch 



protein. equivalent, 



lb. lb. 



70 lb. of swedes ... ... ... 0'2i 5^25 



20 oat straw .., ... ... o "20 3-40 



4 decort. cotton-cake ... 1*58 2*89 



i'99 1 1 '54 



These figures would be regarded as satisfactory, and could 

 be checked by referring to the percentage of fat, which, as 

 it is small in the case of swedes and oat straw, would come 

 chiefly from the cotton cake. Cotton cake contains about 

 9 per cent, of oil, so in 4 lb. there would be 0*36 lb.; in 

 addition o'i lb. would come from the straw, so that 0*46 lb. 

 would be the total, which would be near enough to . the 

 standard. 



Another ration suggested for a cow in full milk is the 



following : — 



Digestible Starch 



protein. equivalent, 



lb. lb. 



251b mangolds... ... ... ... 0*03 1 *8 



6 hay 0-30 2-17 



11 ,, oat straw... ... ... ... on 1*87 



4 wheat meal ... ... ... 0*44 2*92 



8 bean t-6o 6"oo 



2-68 1476 



And it conforms very well with the standard already given 

 for a cow yielding 40 lb. of milk per 1,000 lb. live weight 

 per day. 



