Ear-notching helps identify a pig's litter and which one of the litter it is, giving each pig a unique identity number. Notches are placed in one of five locations in the pig's right ear — to show the litter number — and in one of three locations in the left ear — to show the individual pig number.
Specifications
Key Features
Avoid placing a notch midway in the outside edge of either ear (that is, close to the dotted line indicated in Figure 1). Such marks can easily be mistaken for either a 1 or a 3 or a 9 or a 27.
Remember, the reference to left and right ear refers to the pig’s left or right ear, as viewed from the rear of the pig. Left and right does not refer the viewers’ left or right in a situation where the pig is facing the viewer.
If pigs are notched at 1-3 days of age, the task is much easier. If you allow pigs to become large (100 lb), the task is considerably more demanding mentally and physically.
Use a V-ear notcher to notch piglets weighing less than about 25 pounds. These notchers typically make a notch that is 3/16 to 1/4 inch deep (Figure 5). For larger pigs, a notcher that makes notches 1/2 inch deep is recommended.
It is important to have some disinfectant available to dip the notchers in after each use. In some cases, spraying larger pigs with a wound dressing can be helpful.
Avoid making notches too shallow, as they may become hard to read or possibly heal shut. A notch that is too deep, especially one toward the ear tip, may result in a torn ear.
Leave at least 1/4 inch between notches to ensure easy reading. Do not make notches too close to the tip of the ear, as these can be torn off. When making the #27 notch, uncurl the ear with your fingers so you can make it deep into the cartilage. Otherwise, it might be unreadable later.
If notching ears on older or larger pigs, it may be necessary to house them in separate pens until the notches heal. Pen mates not notched may be attracted to the bloody notches and start ear biting.