What FAMACHA actually measures
FAMACHA is a field scoring system developed for small ruminants that estimates anaemia by looking at the colour of the mucous membrane inside the lower eyelid. The examiner gently exposes the inner eyelid and matches its colour against a standard laminated chart, which runs in five steps from a healthy deep red through pink shades to a dangerous pale white. It takes seconds per animal and needs no laboratory, which is why it has become a routine tool on goat and sheep farms.
Why eyelid colour tracks one particular worm
The system works because of one parasite: the barber pole worm, a stomach worm that pierces the stomach lining and feeds on blood. A heavy burden literally drains the animal, red cell numbers fall, and membranes that should be red turn pale. FAMACHA was designed around that relationship — it is essentially a way of asking each goat or sheep, at the fence line, whether blood-feeding worms are getting ahead of it. Animals coping well stay red; animals losing the battle pale gradually, which is what makes repeat scoring more useful than a single look.
What the scores are used for
Shepherds use FAMACHA to practise selective treatment: animals scoring in the healthy range are left untreated, while animals in the pale, anaemic range get attention under their vet's parasite plan. Treating only the animals that need it slows the development of wormer resistance on the farm and identifies the repeat offenders — the individual goats or sheep that pale every season — as candidates for culling from the breeding flock rather than carrying passengers. During warm, wet grazing weather, when barber pole worm thrives, checks may be run every few weeks alongside hands-on condition checks.
The limits every owner should know
FAMACHA reflects anaemia, and mainly anaemia from that one blood-feeding worm. It does not detect other parasites that cause scouring or weight loss without draining blood, and pale membranes can also come from other illnesses entirely. Bottle jaw — a soft swelling under the jaw — can accompany severe cases but is not part of the score. A pale score is therefore a prompt for investigation and a vet conversation, not a diagnosis, and technique matters: scoring in poor light or rushing the eyelid exposure produces unreliable colours.
Building it into your flock routine
Work the check into handling you already do — hoof trimming, condition scoring, pre-breeding checks — and record the score against each animal's identity every time. A dated run of scores shows which animals hold their colour, which slide every summer and whether the flock as a whole is paler than last month. Keeping each goat or sheep's FAMACHA scores, fecal results and treatment dates in its KinsLe Pet Passport turns a pocket colour chart into a season-by-season parasite record your vet can plan from.