BVWDINa THE SILO. % 



ton of contents of the silo to build it. To illus- 

 trate: a silo ten feet in diameter is about 31% 

 feet in circumference and has an area of 75 

 square feet, while one twenty feet in diameter is 

 nearly sixty-three feet in circumference and has 

 an area of 300 square feet. It will cost half as 

 much in material and labor to build one ten feet 

 in diameter as one twenty feet in diameter and 

 one twenty feet in diameter will contain four 

 times as much as one ten feet in diameter. 

 Twenty feet in diameter is a desirable size to 

 build, and I would not build larger than twenty- 

 five feet in diameter. As to depth I have not 

 learned that there is any danger of getting them 

 too deep. I certainly have found no objection 

 to a depth of thirty-eight feet. 



Amount of Exposed Surface per Cow. — One 

 point about the matter of diaineter that must not 

 be forgotten is that it must not be too largfe for 

 the number of cattle to be fed from it. Eight 

 surface feet per cow to' be fed is the danger 

 limit, and six feet is safer. To explain: a silo 

 that is twenty feet in diameter has 300 surface 

 feet of area and when we apply the rule of six 

 surface feet per cow we find that we can feed 

 safely fifty cows from it and keep ahead of de- 

 cay. When we apply the rule of eight surface 

 feet we can feed as few as forty cows from a 

 twenty foot silo. This may be done safely when 

 care is exercised in keeping the surface feed 



