280 FEEDS AND FEEDING 



permits rapid fermentation when stored. On the other hand the void- 

 ings of the cow and pig form "cold manures," the high water content 

 checking fermentation. Sheep manure has the highest value per ton, 

 based on fertilizing constituents; pig manure the lowest. Mixed farm 

 manure, including bedding, carries about 10 Ibs. of nitrogen, 5 Ibs. of 

 phosphoric acid, and 10 Ibs. of potash per ton, and is therefore worth 

 about $3.05 a ton. 



440. Amount of manure voided. Various methods have been suggested 

 for computing the amount of fresh manure feces and urine produced 

 by farm animals. Heiden 9 found that 100 Ibs. of dry matter fed to farm 

 animals produced the amount of fresh manure shown in the first column 

 of the following table. The second column gives the weight of manure 

 plus bedding, computed from data by Van Slyke. 10 



Manure from 100 Ibs. dry matter fed to farm animals 



Manure Manure plus bedding 



Lbs. Lbs. 



Horse 210 280 



Cow 384 427 



Sheep 183 285 



Owing to the high water content of cow manure, a larger amount is 

 produced from 100 Ibs. of dry matter in the feed than in the case of 

 the horse or sheep. 



The amount of manure voided daily by farm animals varies widely, 

 depending on the nature and amount of feed given and the age, activity, 

 etc. of the animals. The following table, adapted from Van Slyke, 11 is 

 a helpful approximation of the amount of manure voided daily by farm 

 animals, per 1,000 Ibs. live weight. 



Daily production of manure l>y farm animals per 1,000 Ibs. live weight 



Feces Urine Total manure Manure plus bedding 



Lbs. Lbs. Lbs. Lbs. 



Horse.. ... 39 10 49 65 



Cow 52 22 74 82 



Sheep 23 11 34 53 



Pig 50 33 83 99 



Based on live weight, the. pig yields more manure than other farm 

 animals, due to the heavy feed consumption per 1,000 Ibs. live weight 

 and the watery nature of the manure. 



441. Fertilizing constituents produced yearly. According to Van 

 Slyke, 12 the amounts of fertilizing constituents voided annually by farm 

 animals per 1,000 Ibs. live weight are about as follows : 



sStorer, Agriculture, 1899, II, p. 289. n Fertilizers and Crops, pp. 294, 303. 



10 Fertilizers and Crops, p. 303. 12 Fertilizers and Crops, p. 295. 



