Livestock Numbering and Ear Tag Colours: A Simple System
How to number sheep, goats and camels and use ear tag colours by birth year, sex or group, so every animal has a unique identity and records stay accurate.
The simplest reliable system is to give each animal a number and an ear tag colour, and treat the pair as its identity. Use one colour per birth year (or per group or sex), number animals from 1 upwards within each colour, never reuse a number-colour pair, and record every tag in your herd records. This keeps numbers short and avoids duplicates.
Every record you keep, from weights to vaccinations and sales, depends on knowing which animal is which. When numbers repeat, tags are lost or workers read them differently, the records lose their value. A clear numbering and colour system costs almost nothing and fixes this at the root.
Why use number + colour together?
Numbers alone grow long and hard to read. After a few years a flock may reach number 1,487, which is difficult to write on a small tag, read from a distance or call out in a busy pen. Colours alone cannot tell individuals apart.
Combining the two gives you:
- Short numbers. Each colour starts at 1, so most tags carry only two or three digits.
- Information at a glance. If the colour means birth year, you know the animal's age group before you read the number.
- Fewer reading errors. "34 green" is easier to call out and harder to confuse than "1,034".
- Easy sorting. Workers can draft all animals of one colour (one age group, for example) without checking a list.
The rule that makes it work: the number and the colour together are the identity. "25 yellow" and "25 blue" are two different animals, and the same pair must never be given to two animals in the herd.
Choosing what the colour means
Decide one meaning for colour and stick to it. The most common choices:
| Colour means | How it works | Best for | Watch out |
|---|---|---|---|
| Year of birth | One colour per year, rotating every few years | Breeding flocks, culling by age, replacement planning | Choose enough colours so an old colour returns only when those animals have left the herd |
| Sex | One colour for males, another for females | Fattening units and mixed batches | Gives little extra information in breeding flocks |
| Group or purpose | Colours for breeding stock, fattening, sale | Farms with distinct production units | Animals change groups, but tags do not |
| Owner or partner | One colour per owner in a shared herd | Herds owned by partners or family members | Ownership changes must be recorded |
For most breeding flocks of sheep and goats, colour by year of birth is the most useful: it shows age at a glance and supports decisions on culling and replacements. Many farmers rotate through five or six colours so that a colour only comes back when the animals born in that year are mostly gone.
If your country has an official identification scheme (for example national ear tags for traceability), follow its rules for official tags. Your management colours can work alongside the official tag.
Numbering rules that prevent mistakes
- Start at 1 for each new colour. Number births in order as they happen.
- Never reuse a pair while the old animal is still in your records, even if it was sold or died. Its history should stay linked to its own identity.
- Write the number large and clear, using a proper tag marker or pre-printed tags. Avoid hand-written numbers that fade.
- Avoid confusing digits. Some farms skip numbers like 6 and 9 alone, or add a dot under 6 to tell it apart from 9 when the animal turns its head.
- Decide the ear. For example, females in the right ear and males in the left, or official tag in one ear and management tag in the other. Write the rule down.
- Replace lost tags with the same pair. When a tag falls out, put a new tag with the same number and colour, and note the replacement.
- Tag early. Tag newborns soon after birth, once the ear is strong enough, so mother and offspring are linked from day one.
For larger herds, an electronic tag can be added next to the visual tag. Our guide on RFID ear tags explains when that pays off.
Applying the system on your farm
Start with a short written plan that every worker can follow:
- Which colour this year's births will receive.
- Where the next number starts for that colour.
- Which ear for which tag.
- Who records new tags and replacements, and where.
Then tag in batches: all animals of one age group or pen at a time, checking each number against your list as you go. In camels, where ear tags are less common, the same number logic can be used with neck collars or tags, combined with the owner's traditional brand.
Keeping tags and records in sync
The tag is only the key; the value is in the record behind it. If your records do not use the same number-colour identity, the system breaks again.
In Throf every animal is registered with its number and colour tag as its identity, together with breed, sex, birth date, weight, photo, mother, father and group. When you import your existing herd from Excel, include a number column and a colour column, and check that each pair is unique; our article on Excel vs a livestock app shows how to prepare the file. Clear identities also make pedigree records and inbreeding control far easier, because each lamb or kid is linked to the right mother and father.
Common mistakes to avoid
- Changing the meaning of colours from one year to the next.
- Giving a newborn the number of a dead animal "because it is free".
- Letting each worker invent their own numbers.
- Recording "25" without the colour in notes and reports.
- Leaving lost tags unreplaced for weeks.
FAQ
What do ear tag colours mean for sheep and goats?
There is no single universal code for management tags. Each farm chooses a meaning, most often year of birth, sex or group. Official tags in some countries have their own rules, so follow those where they apply.
How should I number my lambs and kids?
Start at 1 for each tag colour and number births in order. The number and the colour together form the animal's identity, so the same pair should never be used twice in the herd.
Can two animals have the same number?
Yes, if they have different tag colours, for example 25 yellow and 25 blue. They must never share both the same number and the same colour.
What should I do when an ear tag falls out?
Replace it as soon as possible with a tag of the same number and colour, and record the replacement so the animal's history stays in one file.
General guidance only — it does not replace your veterinarian or the competent authority in your country.
