Deworming Records for Sheep and Goats: Making FAMACHA Work
The wormer that cleaned up your flock five years ago may not be doing much now. That is not a dosing mistake — it is resistance, and it is the central problem in small-ruminant parasite control. Barber's pole worm (Haemonchus contortus), the blood-feeder behind most summer losses in sheep and goats, has developed resistance to anthelmintics in every major class, and University of Calgary research notes that resistance to ivermectin and benzimidazoles is already common in western Canada. You cannot buy your way out with the next product on the shelf, because there isn't an endless shelf.
The strategy that actually slows resistance — selective deworming guided by FAMACHA — works. But it only works if you keep records. Here is why, and what to write down.
Why blanket deworming stopped working
The instinct is to deworm the whole flock on a schedule. That instinct is what bred the resistance. Every time you treat every animal, the only worms left to repopulate the pasture are the ones the drug didn't kill — the resistant ones. Do that a few seasons running and the resistant worms are the population.
The counter-strategy rests on a word worth knowing: refugia. Refugia is the share of the worm population not exposed to a dewormer — the worms in untreated animals and on the pasture. Those susceptible worms breed with any survivors and dilute resistance, keeping your remaining products working longer. Leaving some animals untreated on purpose feels backward. It is the single most important thing you can do to keep a dewormer effective.
FAMACHA: treat the animals that need it
The practical question becomes: which animals do you leave untreated? FAMACHA answers it for barber's pole worm specifically. Because Haemonchus feeds on blood, a heavy burden shows up as anemia, and anemia shows up in the color of the lower eyelid. The FAMACHA card scores that color from 1 (red, healthy) to 5 (white, severely anemic). Animals at the pale end get treated; animals at the red end are left as refugia.
A few honest caveats, because this is a tool, not a cure:
- FAMACHA is validated for barber's pole worm, which causes anemia. It does not catch worms that cause scours rather than blood loss, so it pairs with fecal egg counts and body condition, not replaces them.
- The cards and training come through your veterinarian, and the exact score cutoff for treating is a decision to make with them for your flock and region.
- It is a chute-side check on every animal, every few weeks through the danger season — which is exactly why the records matter.
This article is about the recordkeeping that makes the strategy run. It is not veterinary advice; build the actual protocol — products, timing, and thresholds — with your vet.
The records are the whole point
Score an animal once and you have a treatment decision for today. Score the same animals over a season and over years, and you have something far more valuable: a map of which animals carry the load and which don't.
That map is where the money is. In any flock, a small number of animals carry most of the worms. The records find them:
- The repeat offenders — ewes or does that score 4 and 5 every check, year after year — are your cull-for-resistance candidates. Without records, they blend in. With records, they have a name and a history.
- The animals that never need treatment are doing two jobs: they are your refugia, and they are the genetics worth breeding from. Parasite resistance is heritable, and selecting for it is a long game you can only play if you wrote the scores down.
- Pasture and season patterns emerge too — which fields and which weeks pushed scores up — so next year's grazing plan is informed instead of guessed.
A blank you didn't fill is a data point lost forever. The producer who treats selectively but keeps no record gets the short-term refugia benefit and throws away the long-term selection benefit.
What to record at each check
Keep it to what you will actually use, on paper, in a spreadsheet, or in an app:
| Field | Why it earns its place |
|---|---|
| Date | Ties scores to season and weather |
| Animal ID | The record is worthless without it |
| FAMACHA score (1–5) | The decision, and the trend over time |
| Treated? (y/n) | Who is refugia, who got product |
| Product / class given | Tracks which class you are leaning on |
| Body condition | FAMACHA plus BCS catches more than either alone |
| Notes | Bottle-jaw, scours, a doe nursing triplets |
A 200-ewe flock checked three times across the parasite season is 600-plus scores. On paper that is a stack of sheets you will not cross-reference by hand. The value only shows up when you can ask the record a question — "show me every ewe that scored 4 or worse more than once this year" — and get a cull list back.
Where Ranch.Bot fits
This is a recordkeeping problem before it is anything else. Ranch.Bot keeps per-animal treatment and observation records you enter in plain language — "ewe 184, FAMACHA 4, treated, body condition 2.5" — and ties them to the animal, so at culling and breeding time you pull a ewe's full parasite history instead of trusting memory. The protocol stays between you and your vet; the records that make it pay off are the part Ranch.Bot handles.
Resistance is not reversible. The dewormers you have are the dewormers you get, and how long they last depends on the choices — and the records — you make this season.
Ranch.Bot turns plain-language notes like "ewe 184, FAMACHA 4, treated" into structured records you can search at culling and breeding time — and you review every record before it saves. Start a 14-day free trial at ranch.bot.