The Pkoduction of Manthbe. 



187 



in general terms that eighty per cent of the fertilizer value of animal 

 food is recovered in the excrement, and when we consider that of the 

 eleven experiments five were made with young animals it is fair to 

 presume from the results of these experiments that considerably more 

 than seventy per cent would be recovered in ordinary practice, particu- 

 larly if a considerable portion of the stock fed were fattening animals. 

 Below is given in tabular form the average amount of excrement and 

 ts value recovered from 1,000 pounds of live weight of animal. 



Excrement Recovered per 1,000 Pounds Live Weight of Animal. 



KIND OF animal. 



Sheep , 

 Calves , 

 Pigs . . 

 Cows . . 

 Horses 



Number of 

 experiments. 



6 

 2 

 3 

 4 

 1 



Pounds per 

 day. 



34.1 



67.8 

 83.6 

 74.1 



48.8 



Value per 

 day. 



$.0715 

 .067 

 .1668 

 .0802 

 .076 



Value per 

 year. 



$26.09 

 24.45 

 60.88 

 29.27 

 27.74 



It will be seen from this table that the largest amounts recovered 

 per day were in experiments where the food consumed gave a com- 

 paratively narrow nutritive ratio or else the food was largely liquid 

 as was .the case with the calves. In either case, it was the amount of 

 urine secreted that greatly increased the total weight of excrement. 



As the values given in this bulletin have been based on those given 

 for the value of commerical fertilizers it does not follow that any 

 farmer under all conditions will be able to get that value from the 

 manure any more than he is guaranteed to receive that value from the 

 same amount of plant food in commercial fertilizers. It may be the 

 prices given are too high and that they should be greatly reduced or 

 even cut in two. The value per pound of each fertilizing ingredient 

 should be determined by each farmer for himself as he determines 

 whether he can or can not afford to buy commercial fertilizers at the 

 market price. These values, however, afford a means of comj)aring 

 the value of manures made by the different kinds of domestic animals 

 and vary from |24.43 per year from calves to $68.88 per year from 

 pigs. These values are calculated for the- year at the same rate and 

 value for the whole year as the average of the experiments, which 

 would probably be somewhat too high for the classes of animals that 

 are turned to pasture a considerable portion of the year; for animals 

 that are kept in stalls or pens throughout the year there is no reason 



