Concrete Silos 



51 



of rations for the ones used in the table, they can de- 

 termine very accurately what size herd they can raise 

 on any diameter of silo, or conversely, they can deter- 

 mine the size of silo necessary for any given herd. 

 Multiplying the depth taken away each day by the 

 number of days which they desire to feed, they will be 

 able to get the height of silo necessary. The usual 

 figure taken is 180 days, although the increasing preva- 



TABLE II SHOWING MINIMUM NUMBER OF ANIMALS TO 

 BE FED DAILY FROM EACH DIAMETER OF SILO 



lence of summer feeding is another factor which is 

 helping to increase the height of silos. 



Table III, taken from BuUetin 141 of the Iowa Agri- 

 cultural Experiment Station, gives the capacity in tons 

 of various diameters and heights of silos ; also the num- 

 ber of acres necessary to fill the silo at 15 tons per acre, 

 and the amount which should be fed daily, this amount 

 corresponding to that given in the second column of 

 Table II. 



The Wyoming Farm Bulletin suggests that the fol- 

 lowing formula may prove serviceable in estimating 

 the actual amount of silage in the silo, assuming that 1 

 cubic foot of ensilage weighs 30 pounds : 



