284 ELEMENTARY TREATISE ON STOCK FEEDS AND FEEDING 



Acreage for One Sow and Pigs 



Acres 



Special pasture for i sow o. 20 



Regular pasture for 14 pigs 1.17 



Corn in rotation with pasture 1.17 



Total 2.54 



"For each sow and her two Htters of pigs there is therefore 

 required 2.54 acres. Dividing 50 by this we get 19.7. Retain- 

 ing the fraction of this number as a factor of safety, the area of 

 the special pasture for the sows is 4 acres. The area of wheat 

 and clover pasture is 23, and the area of corn 23 acres. 



"If increasing the area of pasture and buying corn to feed the 

 hogs on this pasture is more profitable than raising the corn, it 

 would also be more profitable to buy feed for the horses. If this 

 is done, to find the number of sows that can be kept we divide 

 60 acres by 2.54, the result being 23.6. This gives the area of 

 special pasture for the sows as 4.72 acres, leaving 55.28 acres to 

 divide into two fields of 27.64 acres each for the rotation. 



"Twenty-three sows would produce 322 pigs annually. The 

 amount of corn and hay that must be bought under this system, 

 assuming that the corn raised yields 60 bushels per acre, would 

 be: Hay for 3 horses, Syi tons; corn for three horses, 270 

 bushels; for 23 sows and 322 pigs, in addition to corn raised, 

 2,138 bushels. 



"In the system of hog farming just outlined difficulty some- 

 times arises from the fact that when wheat begins to shoot up in 

 the spring it has a deleterious effect on the intestinal canal of 

 the hog. If trouble of this kind is experienced, rye may be 

 substituted for wheat. Along the extreme southern edge of 

 the belt to which this type of farming is adapted winter oats may 

 be used, and these are better than either wheat or rye for hog 

 pasture." 



Cropping System for Illinois Hog Farm. — According to Farm- 

 ers' Bui. 272, the following cropping system has been used on 

 a hog farm in Illinois with good success for 10 years : 



