Internal Parasite Control and Goat Welfare

Gastrointestinal nematodes are the primary welfare challenge in extensively grazed goats, with sustainable control essential for both welfare and long-term anthelmintic efficacy.

Key Facts

Goats are more susceptible to gastrointestinal nematodes than sheep because they have lower innate resistance and mount weaker acquired immunity
Haemonchus contortus (barber pole worm) causes acute welfare harm through blood loss — anaemia, bottle jaw and death in heavily infected animals
FAMACHA scoring of conjunctival colour provides a practical welfare-relevant indicator for Haemonchus-specific treatment decisions
Anthelmintic resistance is widespread in goat nematode populations — targeted selective treatment (TST) is essential for sustainable control

Welfare Considerations

Goat parasite welfare is dominated by the severity and rapidity of Haemonchus-induced anaemia — heavily parasitised goats deteriorate from subclinical anaemia to severe welfare compromise within weeks during peak transmission periods. FAMACHA scoring enables identification of individuals requiring treatment without treating the whole herd, slowing resistance development while protecting high-welfare-risk animals. Refugia management — maintaining some animals off anthelmintic treatment to preserve drug-susceptible parasite populations — is the cornerstone of sustainable welfare-effective control.

What You Can Do

Learn FAMACHA scoring and conduct assessments every 2-3 weeks during peak transmission season
Treat only animals with FAMACHA scores 3-5 (moderately to severely anaemic) unless clinical signs warrant broader treatment
Maintain refugia by treating only half the herd at any one treatment event — this preserves drug-susceptible worm populations
Test for anthelmintic resistance annually using faecal egg count reduction tests — treatment failures indicate resistance requiring protocol review