88 PRINCIPLES OF FEEDING FARM ANIMALS 
Animal Products 
Per cent of nitrogen Per cent of ash constituents 
i 
f 
Obtsined verde In total Obtained bare ee 
as animal iqu : ive wei, 
product grevenieut excrement or mille perspiration 
Horse at rest....) None 57.0 100 None 100.0 
Horse at work...| None 70.6 100 None 100.9 
Fattening ox.... 3.9 73.5 96.1 2.3 97.7 
Fattening sheep. . 4.3 79.0 95.7 3.8 96.2 
Fattening pig.... 14.7 64.3 85.3 4.0 96.0 
Milch cow...... 24.5 57.4 75.5 10.3 89.7 
Calf fed on milk. . 69.3 25.6 30.7 54.3 45.7 
We note that milch cows void in the total excrement about 75 
per cent of the nitrogen contained in the feed and about 90 per cent 
of the ash constituents. Young growing animals give somewhat 
similar quantities, while fattening animals void about 90 per cent 
of nitrogen and 96 per cent of the ash materials in the liquid and 
solid excrement.* Considering the relation between the different 
classes of farm animals on most stock farms, young and old, milk- 
producing and fattening animals, etc., we may assume that at least 
80 per cent of the entire manurial value of the feeding stuffs fed 
on the farm will be voided in the solid or liquid manure of the ani- 
mals and will contribute to maintain the fertility of the land when 
the manure is applied thereon. The direct value of feeding stuffs 
for fertilizer purposes is, therefore, obtained by taking 80 per cent 
of the total fertilizer value calculated from Table V in the Appendix. 
When a farmer sells a ton of alfalfa hay, he sells fertilizer 
materials that if purchased in the form of common fertilizers would 
cost him over $8. He sells the amounts of fertilizers off his land in 
every ton of straw, hay, and other crops, as shown in the table. If 
he sells 2000 pounds of milk (232 gallons), $1.97 worth of fertility 
leaves the farm with it; with a ton of butter, 38 cents; with a ton of 
beef, $9.06; with a ton of pork, $5.93, ete. According to Burkett, 
a farmer selling hay sells, in the form of fertilizer value, one-half 
as much as he receives; if he sells pork, he receives twenty times as 
much for it as the value of the fertilizers contained in it; if milk, 
forty times, and if butter, one thousand times.* 
These figures show plainly that, so far as maintenance of the 
fertility of the land goes, it is a better plan for a farmer to sell 
3 Wisconsin Report 13, p. 270 et seq. 
*“ Feeding Farm Animals,” p. 311. 
og 
bea 
Quantities of Nitrogen and Ash Constituents Voided by Animals or Obtained in / | , 
fo 
