SOME OE THE ANIMALS EED AND SLATJGHTEEED AS HUMAN FOOD. 537 
analysed Pig. With regard to the amount of mineral matter in the increase, attention 
should be called to the fact, that, according to the figures in the Table, it was always 
very small; whilst, in many cases, there was apparently no increase whatever, but even 
a loss of mineral matter during the fattening process. From the general character and 
habits of the animal, and its known tendency to fatten rather than to grow, we should 
indeed anticipate that the bony frame-work, which is the chief storehouse of mineral 
matter, would develop proportionally much less in the fattening Pig, than in either 
fattening Sheep or Oxen. Still, it would be hardly safe to assume, upon the evidence of 
the analysis of two ammals alone, that there would frequently be an actual reduction of 
the total mineral matter of the body, during the fattening period. The alternative is 
to suppose, that the analysed fattened Pig was of rather lighter frame, than should 
ha\e been, for strict comparison with the analysed leaner one. 
The following is a Summary of these numerous estimates of the composition of the 
increase of fattening oxen, sheep, and pigs ; — 
Table XI. Summary of the Estimated Composition of the Increase of 
fattening Oxen, Sheep, and Pigs. 
Cases. 
Calculated composition of 100 iTiCTQdHB 
whilst fattening. 
Mineral 
matter. 
Nitrogenous 
compounds 
(dry). 
Fat. 
Total 
dry 
substance. 
Average for 98 Oxen 
Average for 348 Sheep 
Average for 80 Pigs 
The analysed fat Pig 
1*47 
2-34* 
0-06 
0*53 
7-69 
7*13 
6- 44 
7- 76 
66-2 
70- 4 
71- 5 
63-1 
75*4 
79-9 
78-0 
71-4 
Mean 
MO 
7-26 
67-8 
76-2 
^ It would appear, that we may probably estimate the increase in weight of liherallv 
pd Oxen, over six months or more of the final fattening period, to contain from 70 to 
■ per cent, of its weight of total dry substance. Of this, by far the larger proportion, 
say to 65 parts, will be fat ; 7 to 8 parts will be nitrogenous substance ; and 1 to 
part mineral matter. ^ 
On the same plan of calculation, the final increase oi well-fed Sheep, fattening during 
several months, will probably consist of 75 per cent., or more, of total dry substance; of 
W 1C to 70 parts will be fat ; 7 to 8 parts nitrogenous compounds ; and (making 
a owance for the error in the ash of the wool) perhaps about 1^ part of mineral matter. 
_ The increase oi Pigs fed for fresh pork, during the final two or three months on fatten- 
substance, 63 to 68 per 
cen . 0 tat, 6 to 8 per cent, nitrogenous substance, and considerably less than 1 per 
of fhf J ^ ^ ^ amount of adventitious matters in the wool 
ot the sheep analysed-particularly the fatter ones. 
