RFID Ear Tags for Sheep: Are They Worth It, and How Do You Start?

"Number 47" sounds simple. In a barn of 300 head, reaching number 47 and knowing its history means catching the animal, reading a dirty ear tag, then searching a notebook or a file. With electronic tagging that collapses into a second: you hold the reader near the animal and its file opens on your phone.

But is it worth it for every flock? The honest answer is no, not always. Here is how it works and when it genuinely pays.

How electronic tagging works

An electronic tag (ear tag or bolus) carries a chip with a unique number — no battery, no maintenance. When the reader comes close, its electromagnetic field powers the chip, which transmits its number.

The common standard in livestock is FDX-B (ISO 11784/11785), giving a globally unique 15-digit number. The reader is a stick or handheld unit that pairs with your phone over Bluetooth; some readers work up to about 10 metres in open conditions (real range drops with metal, crowding and wet animals).

In Throf you pair the reader over Bluetooth from inside the app (Android and iOS), and every scan opens the animal's file immediately — you can record a weight, a treatment or a note from the same screen without searching for the number.

Where it saves real time

• Weighing day: scan → enter weight → next. Two people instead of three (one holding, one reading, one writing).
• Vaccination day: the dose is recorded against the right animal, with no misread number.
• Stocktaking: a quick sweep of the group instead of counting by hand three times.
• Buying and selling: a unique number that cannot be duplicated or misread, and a record that proves the animal's history to a buyer.
• Pedigree: linking a newborn to its dam and sire with a number that cannot be confused.

When it is not worth it

Be honest with yourself. If your flock is under 50 head, you manage it yourself, and you know every animal by sight, good paper tags plus an app that records the data are enough. The real benefit starts when:

• the flock passes 100–150 head, or
• more than one person enters data, or
• you sell to buyers who want documented traceability, or
• you deal with an authority that requires approved tagging.

The realistic cost

Three lines: the tags (a per-head cost that repeats with every newborn), the reader (a one-off, and worth buying dust- and water-resistant), and the initial time to tag the existing flock. Weigh that against what it saves: working hours on every weighing or vaccination day, the errors that disappear, and the ability to prove an animal's history at sale.

Fitting tips that prevent most problems

1. Position: the middle third of the ear, between the cartilage ribs — not too close to the head, not at the edge.
2. Hygiene: disinfect the applicator between animals. Ear infection is the biggest cause of lost tags.
3. Age: at least two weeks old, so the ear is strong enough.
4. Weather: avoid extreme heat and heavy fly seasons to reduce infection risk.
5. Keep the visual number too: a readable tag carrying the same number alongside the electronic one — if the reader fails, the number is still there.
6. Record replacements: when a tag is lost, register its replacement against the same animal so its history does not split into two files.

The short version

RFID is neither a luxury nor magic: it is simply a faster, more accurate way of connecting an animal to its file. All the value is in the file itself — with no record to open, the reader is just a screen showing 15 digits. Start by tagging one group (the dams, for example), run one full weighing cycle, and expand if you see the difference for yourself.