FAMACHA scoring combined with refugia-based targeted selective treatment (TST) is the recommended integrated approach for gastrointestinal nematode management in small ruminants, slowing anthelmintic resistance while maintaining production.

FAMACHA scoring assesses anemia severity by examining the color of the lower palpebral conjunctiva on a 1–5 scale, where scores 1 and 2 indicate healthy animals, score 3 represents a borderline condition, and scores 4 and 5 indicate severe anemia.Veterinary Para…+1 The system was developed specifically to detect clinical anemia associated with Haemonchus contortus infection and guide selective anthelmintic treatment.Journal of the…

Treatment thresholds depend on the clinical context and the performance metric being optimized. Using a FAMACHA cutoff of ≥3 to define animals requiring treatment maximizes sensitivity for detecting anemia (96.4% in camelids at PCV ≤15%), while a cutoff of ≥4 maximizes specificity (94.2% at PCV ≤20%).Veterinary Para… In small ruminants, when FAMACHA score ≥3 is used as the anemia threshold, false negatives are 5.9% in goats and 12.5% in sheep.Tropical Animal… Specificity reaches 100% when FAMACHA score ≥4 is used as the anemia cutoff, though sensitivity drops to 35.29% in goats and 25% in sheep at that threshold.Tropical Animal…

FAMACHA scoring should not be used as a standalone indicator in all geographic regions. In New York State, no direct association was found between FAMACHA score and fecal strongyle eggs per gram in either sheep or goats, in contrast to validated performance in the southern US.Journal of the… This discrepancy likely reflects regional differences in the proportional contribution of H. contortus relative to other gastrointestinal nematode species, since FAMACHA detects anemia specifically attributable to haemonchosis.Journal of the…

Combining FAMACHA with additional clinical parameters substantially improves TST accuracy. Animals with FAMACHA score ≥3, body condition score ≤2.5, hemoglobin ≤7.5 g/dL in goats or ≤8.6 g/dL in sheep, packed cell volume (PCV) ≤19.8% in goats or ≤22.2% in sheep, and mid-granulocyte percentage ≥7.9% in goats or ≥6.9% in sheep are appropriate candidates for targeted treatment.Tropical Animal… In goats scoring 4 or 5, mean PCV is 19.6%, significantly lower than the mean PCV of 30.8% in goats scoring 1.Journal of Anim… Body condition scoring and fecal egg counts (FEC) are recommended alongside FAMACHA to identify the highest-burden animals.MSD Vet Manuals

Refugia-based management is the mechanism by which TST slows anthelmintic resistance. Parasite populations are not evenly distributed — 75–80% of parasites are typically found in only 20–25% of animals, and these individuals contribute the majority of pasture egg contamination.MSD Vet Manuals By treating only those animals, a substantial proportion of the parasite population remains unexposed to anthelmintics, preserving susceptible alleles that dilute resistant genotypes in the population.Veterinary Para…+1 Whole-herd treatment eliminates this refugium and accelerates resistance selection, particularly when applied during the dry period when pastures are relatively clean.Veterinary Para…

TST reduces total anthelmintic use without negatively affecting production. Refugia-based TST strategies lower overall dewormer use in sheep flocks without affecting production or drug efficacy.Veterinary Para… GIN infections reduce milk yield by a mean of 22% in dairy ewes, so identifying and treating only the animals that genuinely need treatment preserves both herd health and production returns.Veterinary Para…

Seasonal timing of parasite pressure should guide monitoring frequency. Warm and humid months produce the highest FEC levels, exceeding 2,000 eggs per gram, making these periods the highest-risk windows for anemia and pasture contamination.Journal of Anim… In Florida and similar climates, warm humid conditions favor parasite development nearly year-round, requiring more frequent monitoring than in cooler regions.Journal of Anim…

Producer training in FAMACHA certification is essential for consistent implementation. Subjective observer variability is an inherent limitation of manual FAMACHA scoring.Veterinary Para…+1 A structured certification program combining online modules, examination, and hands-on training has demonstrated that 91% of participants increase their knowledge, and 85% report intention to adopt at least one evidence-based practice including FAMACHA scoring, flock monitoring, or research-based deworming protocols.Journal of Anim…

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