270 FARM ANIMALS 
food, often waste products, into human food, and to the 
ease with which these products can be preserved. Before 
the days of cold storage pork was the only meat that 
would stand long shipments. 
15. Marking hogs.—The best means of identifying 
pure-bred hogs is by means of 
permanent ear tags inserted 
in the ears. These may be 
purchased of dealers, with a 
number on each tag. In the 
absence of tags, markings may 
be made in the ears, the posi- 
tion being the governing fac- 
tor. The small numbers are 
represented by the right ear, 
the larger numbers by the left. The corner of each ear 
is marked, and two other incisions are made on both the 
lower and upper edges. A hole punched in the center 
may be used in case a number of hogs are to be identified 
or recorded. 
METHOD OF MarKING Hocs 
