353 



will be fat, 7 to 8 parts nitrogenous compounds, and perhaps l^ part 

 mineral matter. 



The increase ofpiffs, during the final two or three months of feeding 

 for fresh pork, may be taken at 70 to 75 per cent, total dry sub- 

 stance, 65 to 70 per cent, fat, 6 to 8 per cent, nitrogenous substance, 

 and less than 1 per cent, of mineral matter. The increase over the 

 last few months of high feeding, of pigs fed for curing, will doubtless 

 contain a higher per-centage of both fat and total dry substance, and 

 a lower one of both nitrogenous compounds and mineral matter, than 

 that of the younger and more moderately fattened animal. 



As a general result, it appears that about -| ths of the gross increase 

 in live-weight, of animals feeding liberally for the butcher, will be 

 dry or solid matter of some kind. About f rds of the gross increase 

 will be dry fat ; only about 7 or 8 per cent, of the gross increase 

 (and scarcely more than y^th of the total dry substance) will be 

 nitrogenous compounds ; and seldom more than 1-J-, and frequently 

 less than 1 per cent, mineral matter, 



In the case of most of the sheep, and of all the pigs, the com- 

 position of whose increase was estimated, the amounts of mineral 

 matter, of nitrogenous compounds, of non-nitrogenous organic sub- 

 stance, of total dry substance, and sometimes of fat, which were 

 consumed during the fattening period, were determined ; so that the 

 means are at command for studying the quantitative relation of the 

 constituents estimated to be stored up in the increase, to those con- 

 sumed in the food which produced it. 



Taking first the proportion of each class of constituents stored up 

 for 100 of the same consumed, it is concluded, that in the case of 

 sheep, liberally fed on a mixed diet of dry and succulent food, the 

 increase of the animal will perhaps generally carry off less than 3 per 

 cent, of the consumed mineral matter somewhere about 5 per cent, 

 (varying according to the proportion in the food) of the consumed 

 nitrogenous compounds, and about 10 parts of fat for 100 non-nitro- 

 genous substance in the food ; and lastly, that for 100 of collective 

 dry substance of food consumed, there will be, in Sheep, about 8 or 

 9 parts of dry matter in increase stored up. 



The food of the fattening pig contained a much smaller proportion 

 of indigestible woody fibre than that of the sheep ; and it appeared 

 that the pig appropriated to its increase a much larger proportion of 



