FARM BUILDINGS 



343 



liorizonto/s/ee/ 

 I in frgrn outside - 



Typical cjay b Joe As 

 Jxd'f/^ "set on edye- 



//ft cement piaster- 



roof is necessary, and doors must be kept closed except for 

 a short interval at feeding time. 



Dimensions. The quantity of silage consumed by an 

 average dairy cow is i cubic foot, or 40 pounds, per day. 

 The number of days in the year on which silage is fed varies 

 from 180 to 240. The 

 capacity of the silo is rated 

 in tons. Silage spoils by 

 exposure to air, and a 

 depth of at least 2 inches 

 should be fed from the top 

 every day to prevent waste. 

 For determining the size 

 of a silo a diameter should 

 be selected such that one 

 day's feeding of stock will 

 require at least a depth of 

 2 inches of silage. This 

 may be determined as fol- 

 lows : The area of the silo 

 in square feet, multiplied 

 by >^, multiplied by the 

 weight of silage per cubic 

 foot in pounds, equals the 

 total weight fed per day in 

 pounds. This statement 

 may be reduced to the 

 following rule: To obtain 

 the diameter of the silo, extract the square root of the 

 product of the number of cows multiplied by 7>£. To 

 determine the height, multiply 2 inches by the number of 

 days on which silage is to be fed. For example, to find the 

 size of a silo required to feed 50 cows for 200 days: 

 50X7^ = 375. The square root of 375 is 19.4. Therefore 

 19.4 feet is the proper diameter. Since odd sizes are not 

 made, the nearest commercial diameter to 19.4 is 20 feet. 



I4.JJVIIJ'.' 

 I 



*. . > * 



■ %i l ±MJ'w^>*=-l>h:»> -- *>>> - > >> -» 1 - 



4 "drain ///e' 



Fig. 272. 



After University of Minnesota 



Wall section of hollow-block silo 



