6 URINE. 



with regard to the amount of solid excreta produced 

 by the food, the following percentage of organic matter, 

 nitrogen, and mineral substances, originally present in 

 the dry matter of the food, is voided in the dung : 



Cow. Ox. Sheep. Horse. Average. 



Organic matter . 39.5 42.5 44.0 44.1 42.5 

 Nitrogen . . 47.5 33.9 46.7 32.4 40.1 

 Mineral substances 53.9 64.6 57.9 62.5 59.7 



There is one fact to be borne in mind in estimating 

 the manurial value of the dung of different animals 

 viz., that the quantity of dung voided by one ani- 

 mal is much greater than that voided by another. 

 Thus the amount voided by the cow, for example, is 

 much greater than that voided by the horse, so that, 

 in this way, the inferior quality of the former is, to 

 some extent, compensated for by its greater quantity. 



2. Urine. The solid excreta possess, however, very 

 much less manurial value than the urine. The former, 

 as already stated, are undigested food substances ; any 

 fertilising matters which they contain are such as have 

 failed to be digested or absorbed into the animal sys- 

 tem. The urine, on the other hand, contains those 

 fertilising substances which have been digested. 



The amount of nitrogen and mineral matter, how- 

 ever, in the urine does not represent necessarily the 

 total amount of these substances. Thus, in the case 

 of a growing or fattening animal, there is always a 

 certain amount of these substances being absorbed to 

 build up the animal tissue and put on flesh. 



