OJid of their Increase whilst Fattening. 
469 
oxen, over 6 montlis or more of the final fattening' period, will 
consist of 70 to 75 per cent, total dry substtmce — of which 60 to 
65 parts will be fat, 7 to 8 parts nitrogenous compounds, and 
about li part mineral matter. 
On the same plan of calculation the final increase of well-fed 
sheep, fattening during several months, will probably consist of 
75 per cent, or more of total dry substance — of which 65 to 70 
parts will be fat, 7 to 8 parts nitrogenous compounds, and 
perhaps about If part mineral matter. 
The increase of pifj/s fed for fresh pork, during the final 2 or 
3 months on fattening food, may be taken at about 67^ to 721- 
per cent, total dry substance — 60 to 65 per cent, fat, to 8 per 
cent, nitrogenous substance, and considerably less than 1 per cent, 
of mineral matter. The increase over the last few months of high 
feeding, o{ pigs fed for curing, will contain considerably higher pei- 
centages of both fat and total dry substance, and lower ones of 
both nitrogenous compounds and mineral matter, tlian that of 
the more moderately fattened animal. 
It is obvious, that the composition of the increase of the 
animals will vary between that given above for t\ie final fattening 
period, and that of the entire bodies (see Table XII.), according 
to the length of time included within the estimate, and to the 
age of the animal, and character of food, and the consequent 
character of growth. The composition of the increase during 
the whole course of existence will of course be very nearly re- 
presented by that of the animal at the time of being slaughtered. 
The latter will, however, indicate somewhat too high a per- 
centage of nitrogenous substance, and too low a one of fat, for 
the total increase during life ; for at the time of birth the body 
Avill probably contain a higher proportion of nitrogenous to fatty 
matter than at any subsequent period. 
V. — Relation of the constituents stored up in the in- 
crease, TO THOSE consumed IN THE FOOD, BY FATTENING 
ANIMALS. 
Having, in the cases of most of the sheep and of all the pigs 
that were experimentally fed, determined the amount of certain 
constituents of the food consumed to produce a given amount of 
increase in live-weight, and having now arrived at approximate 
estimates of the composition of the increase itself, we have 
obviously the means of calculating the proportion of the con- 
sumed constituents stored up in the increase of the fattening 
animal. 
We shall consider — (1.) the probable amount of each of the 
several constituents stored up in increase, for 100 of it con- 
