130 



DAILY RATION FOR MILCH COW. 



ness of the foregoing feeding standards ; while the Offerton re- 

 sults distinctly indicate that when these are exceeded neither 

 the feeding nor milking returns are satisfactory. At the same 

 time there are indications from feeding experiments in this 

 country and in America that the proportion of albuminoids may 

 frequently be lower with equally good results. 



In Table C nitrogen is valued at 12s., phosphoric acid at 

 3s., and potash at 4s., all per unit. One unit is equal to one 

 per cent, of one ton (22J Ib.). Half the nitrogen, three-quarters 

 of the phosphoric acid, and all the potash are valued in the full 

 manurial values given on the table, these proportions being 

 considered as the average amounts of the manurial constituents 

 reaching the land in the dung. It should be explained that a 

 great waste of nitrogen takes place owing to more than half the 

 nitrogen (and this of the most valuable character) in the food 

 passing off in the urine and the great difficulty of anything like 

 completely conserving this in the dung, and also that in growing 

 animals, and with animals producing milk, a considerable 

 amount of the phosphoric acid is not returned in the dung. 



The full manurial values are allowed when no crop has been 

 taken from the dung, and half, one-quarter, and one-eighth 

 respectively, when one, two, and three crops have been taken. 



