How the Notch System Actually Works in Practice
Most people new to swine management learn about pig identification through the standard notch system, but the reality of using a Pig Ear Notching Worksheet is a lot more specific than the basic diagrams suggest. The system divides each ear into sections. The left ear tracks litter number, and the right ear tracks individual pig number within that litter. A quarter notch at the tip of the left ear means one, half notch means two, and a full notch means three, with the positions moving clockwise. The same logic applies to the right ear for the individual pig. The numbers you create tell you which litter a pig came from and where it sits in that litter. I built my own spreadsheet system years ago instead of relying on paper forms because paper gets ruined by mud, blood, and general farm conditions. My worksheet has columns for farrowing date, sow number, litter number, individual pig number, and then a visual grid that maps out the notches. It prints out cleanly and sticks to a clipboard even when things are wet. When you're farrowing multiple sows in a row and you have to identify pigs within minutes, having the reference sheet already filled in with sow numbers saves you from scrambling to remember which litter went with which batch. The actual worksheet design matters more than people realize. You want a section at the top with the current farrowing date and sow ID. Below that, a table where each row represents one litter. Each row has boxes showing the left ear and right ear diagrams so you can visually map the notches before you commit to cutting. That visual confirmation step prevents about half the errors I see in operation. Someone marks a notch in the wrong position on paper, and they don't catch it until weeks later when records don't match.
Here is the practical workflow I use. Before any farrowing, I print worksheets for all sows expected that week. As each litter is born, I fill in the sow number, farrowing date, and total live pigs. Then I assign notch values immediately while I have the pigs in front of me. I do not wait. There is a strong temptation to let the paperwork sit until later in the day, and that is when mistakes happen. A pig that looked like notch three in the morning looks like notch five after twelve hours of handling, sorting, and regrouping.
Common Mistakes and What to Do About Them
The most frequent error is notching the wrong ear for the wrong data point. Left ear is always litter. Right ear is always individual. Mixing those two creates permanent confusion in your records that you cannot fix after the fact. A second common error is rounding notches instead of using the proper quarter, half, and full notch sizes. Quarter notches are small slits. Half notches cut deeper and wider. Full notches go nearly through the ear margin. If you use half notches when your system requires quarters, your litter number will read incorrectly every time. Another issue is notching through the ear cartilage instead of along the margin. A proper notch removes a piece of the outer ear edge. If you punch straight through the ear tissue, you create a hole rather than a notch, and the notch system reads completely different. Holes also change how the ear heals. They tend to close differently and can create scar tissue that makes future notching harder to read accurately. Temperature and season affect the healing process more than most people account for. Pigs notched in hot weather heal faster but also scar more heavily. Heavy scarring can obscure previous notches, especially on lighter colored pigs. I have seen litters notched in July where the original notch positions became unreadable by weaning time because the healing tissue closed over the markings. In those cases, the notches still exist, but reading them correctly requires holding the ear at a specific angle under bright light.
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A Specific Edge Case I Dealt With
One particular problem came up with a set of twin pigs that had merged ear margins during gestation. When I separated them at birth, each pig had a small flap of extra tissue connecting the tips of their ears. Standard notch placement at the very tip was unreliable because the tissue was malformed. I ended up shifting the notch positions one section clockwise on both ears for those two pigs and marked them with a special code in my worksheet. The code noted that the standard tip positions were altered, and I kept that note visible on every printout that went with those pigs through the entire feeding period. Other workers reading the notches knew to check the worksheet note if anything looked odd about the tip section. This is the kind of situation a generic worksheet template does not prepare you for. You need a system that allows you to add marginal notes without breaking the visual readability of the notch diagrams. My workaround was adding a small footnote column on the worksheet that only fills in when an ear anomaly exists. If the column is blank, the notches read standard. If there is text in that column, you know to look for the special coding note before attempting to read the ear.
Technical Nuances Beginners Miss
The notch system assumes clean, unscarred ear margins. When that assumption breaks down, the entire method becomes unreliable. Pig injuries from fighting, equipment contact, or rough handling damage ear edges in ways that make notching impossible to read months later. If you are managing a herd with a history of aggressive behavior, you should consider supplementing ear notches with ear tags or tattoo marks. Ear notches work best as a primary identification system for young pigs moved through a controlled environment. They degrade over time in high-stress conditions. Another detail that causes problems is the order in which you notches are applied. The standard system reads notches from the tip of the ear moving downward. If you accidentally create a notch near the base of the ear first, you may misread the pig's number entirely. I recommend establishing a consistent notching sequence and following it every single time. Tip first, then the next section down, working toward the base. Do not skip sections or work in random order. Consistency matters more than speed here. The tools you use also matter significantly. A proper notching plier cuts clean edges. Dull pliers tear tissue and create irregular wounds that heal unpredictably. I have replaced cheap pliers with a heavier gauge steel tool, and the difference in notch quality was immediately visible. Clean cuts heal into clear, readable marks. Torn tissue produces ragged scars that become ambiguous within a few weeks.
Limitations You Should Accept
Ear notching is not a permanent identification system in the way some people assume. Notches change shape as the pig grows. A notch placed on a newborn pig's ear looks different on a 250 pound finisher. The relative proportions shift, and the margin stretches. This means visual reading accuracy decreases as pigs age. For most commercial operations, ear notches remain readable through the nursery and early growing phases, but accuracy drops noticeably after six months of age. If your operation requires reliable identification beyond the weaning stage, you should add a second identification method. Ear tags provide better long-term visibility. Tattoo marks under the skin remain readable for life but require different equipment. A combination approach works well: ear notches for early sorting and management decisions, ear tags for later tracking and record keeping. The biggest limitation I encounter is record maintenance. A Pig Ear Notching Worksheet is only useful if someone records the data immediately and accurately. I have seen entire batches of paperwork lost due to weather damage, feed truck incidents, and simple forgetting. Digital backup copies of every farrowing record eliminate that risk. I keep a printed worksheet in the farrowing barn and a digital copy on a cloud folder updated before I leave work each day. The digital copy takes thirty seconds to upload and prevents the loss of a full week's farrowing data if something happens to the physical papers.
There is also the training factor. New workers often struggle with the visual mapping between the worksheet grid and the actual ear. Spending ten minutes walking through several example pigs before starting actual work prevents a large number of recording errors. Show them the notch diagrams, have them match notches on live pigs to the worksheet entries, and correct mistakes immediately. That initial investment of time saves hours of correction work later in the cycle.
