380 



THE FEEDING OF ANIMALS 



The statement of the composition of a Berkshire pig 

 and of a Duroc-Jersey will be found interesting in this 

 connection: 



Table LXXXIV. Composition op the Entire Dhessid Animal, 

 Head, Leaf-laed, and Kidneys Removed. (Wiley.) 



Weight 



Water 



Dry 

 sub- 

 stance 



Ash 



Protejn 



Fat 



Berkshire . . . 



Duroc-Jersey . . . 

 Fat pig, entire animal 

 (Lawes & Gilbert) . 



Founds 

 129 

 149 



200 



Percent 



43.1 

 30.6 



43.9 



Percent 

 56.9 

 69.4 



66.1 



Percent 

 2.6 

 1.8 



1.9 



Percent 



13. 

 9. 



11.9 



Percent 



40.5 

 57.7 



42.3 



It appears that there were stored in the part of the 

 animal analyzed by Wiley only 13 poimds of protein 

 with the Diu-oe- Jersey and about 17 pounds with the 

 Berkshire, the quantities of fat being 52 pounds and 86 

 pounds', respectively. The figures for the entire animal, 

 as analyzed by Lawes and Gilbert, are at the rate of 

 23.8 pounds protein and 84.6 pounds fat, in a pig weigh- 

 ing 200 pounds. 



These proportions bring out sharply the character of 

 the growth with swine. It is to be noted that in no other 

 species, very fat sheep possibly excepted, does the body 

 consist so largely of dry matter, which means that the 

 increase of a unit of live weight involves the storage of 

 more food substance than with other domestic animals. 

 The data at our command warrant the statement, in a 

 general way, that when a pig gains 1.5 pounds daily in 

 live weight he stores not less than .84 pound of dry sub- 

 stance, of which .18 poimd is protein and .63 pound is 

 fat, these figures representing the average growth during 

 the life of the animal. Lawes and Gilbert estimate that 



