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Goat Deworming Dosage & FAMACHA Guide

Calculate weight-based dosages for common goat anthelmintics using ACSRPC small ruminant metabolic adjustment factors, with selective FAMACHA anemia scoring.

Parameters

Quick fill:
lbs
Calculated Output
Recommended Dose
3.4 mLOral Drench
What This Result Means
Calculated dose is 3.4 mL (340 mg). FAMACHA Score 3 is borderline. Deworm only if this goat is pregnant, lactating, a growing kid, showing body condition loss, or has submandibular edema (bottle jaw).
Calculation Details & Equivalents
Calculated Oral Volume
3.4 mL
Active Medication Dose
340 mg
ACSRPC Established Dose Rate
10 mg/kg (2× cattle label dose)
FAMACHA Score Assessment
Score 3 (Evaluate)
Goat Scale Weight Evaluated
34.0 kg / 75.0 lbs
Veterinary & Animal Science Advisory

This calculator provides evidence-based estimates derived from published veterinary equations (NRC, WSAVA, FAO). Outputs are intended for educational and decision-support guidance only. Always consult a licensed veterinarian or qualified specialist for clinical diagnosis, treatment planning, or prescription drug administration.

Understanding the Goat Deworming Dosage & FAMACHA Guide

What This Calculator Does

This goat deworming dosage calculator calculates precise, weight-based anthelmintic doses following American Consortium for Small Ruminant Parasite Control (ACSRPC) metabolic standards. Incorporating the clinical FAMACHA eyelid scoring system protects your herd from fatal barber pole worm anemia while halting drug resistance.

How to Use This Calculator

Enter your goat's weight, select your anthelmintic medication, and choose your observed FAMACHA eye membrane color score. The calculator computes the exact oral volume in mL and indicates whether treatment is clinically recommended or should be withheld to preserve drug sensitivity.

Key Factors That Affect the Result

  • Higher metabolic clearance: goats require approximately 2× the standard cattle dose of fenbendazole (10 mg/kg) and ivermectin (0.4 mg/kg) to achieve effective plasma concentrations.
  • Oral drenching technique: always administer drench over the base of the tongue with a dosing gun; depositing medicine in the front of the mouth stimulates the esophageal groove reflex, bypassing the rumen and decreasing efficacy.
  • Selective treatment (Refugia): deworming the entire herd accelerates drug-resistant superworms. Only treating symptomatic goats (scores 4 and 5) keeps dewormers working for years.
  • Withholding feed: withholding grain and hay for 12 hours prior to oral fenbendazole drenching slows gut transit and significantly enhances drug efficacy.

Why This Matters for Your Goats

Haemonchus contortus (barber pole worm) is the #1 killer of goats worldwide, capable of draining a goat's entire blood volume in weeks. Dosing goats at cattle label rates results in massive underdosing that breeds treatment failure. This tool ensures scientifically grounded dosing.

Veterinary Advisory: This calculator provides educational reference dosing based on ACSRPC small ruminant guidelines. Many dewormers are used extra-label in goats in the US and require a valid Veterinary-Client-Patient Relationship (VCPR).

Formula & Mathematical Methodology

Standard Mathematical Formula
Fenbendazole (Safe-Guard 10%) = 10 mg/kg (2× cattle dose); Ivermectin (1% oral) = 0.4 mg/kg (2× cattle dose); Levamisole = 12 mg/kg (1.5× sheep dose); Deworm only FAMACHA Scores 4 & 5

Formula Variables Defined

m_kgGoat Body Weight(kg or lbs)

Accurate scale weight or heart girth tape estimate

D_fenFenbendazole Dose Rate(mg/kg)

Small ruminant dosage (10 mg/kg = 2× standard cattle label dose)

FAMACHAEye Anemia Score(1–5)

Color score of the inner lower eyelid mucous membrane

Step-by-Step Calculation Example

77 lb (35 kg) Boer Doe with FAMACHA Score 4

A 35 kg breeding doe has pale conjunctiva (FAMACHA score 4: pale pink/white) indicating barber pole worm (Haemonchus contortus) burden.

  1. Body weight in kg: 77 lbs ÷ 2.20462 = 35.0 kg.
  2. Target dose rate for goats (ACSRPC standard): 35 kg × 10 mg/kg = 350 mg.
  3. Volume of 10% suspension (100 mg/mL): 350 mg ÷ 100 mg/mL = 3.5 mL.
  4. FAMACHA Score 4 indicates high parasitic anemia; immediate anthelmintic treatment and nutritional support recommended.
Final Output: Dose: 3.5 mL of Fenbendazole 10% (Safe-Guard) orally. Selective deworming is clinically indicated.

Key Assumptions

  • Goats have higher hepatic metabolic clearance rates than sheep or cattle, requiring higher doses per unit of body weight.
  • Anthelmintics are administered orally over the back of the tongue using a proper drench gun.

Biological Limitations

  • Indiscriminate whole-herd deworming causes rapid anthelmintic resistance; always use selective targeted treatment based on FAMACHA scores.
  • Albendazole should not be administered to does in their first trimester of pregnancy due to teratogenic risks.

Verified Scientific & Veterinary Sources

Version: 1.0.0•Methodology Reviewed: 2026-09-08
1. Dewormer Dosages and Anthelmintic Administration in Goats & Small Ruminantsguideline
American Consortium for Small Ruminant Parasite Control (ACSRPC) (2022). ACSRPC Technical White Paper Series
Access Source Authority
2. Guidelines for the Control and Treatment of Canine Intestinal Parasitesguideline
Companion Animal Parasite Council (CAPC) (2023). CAPC Veterinary Recommendation Protocols
Access Source Authority

Goat Deworming Dosage & FAMACHA Guide — FAQs

Goats evolved as browsing animals (eating tree leaves above ground) rather than grazers, so they developed less natural immunity to pasture parasites. Additionally, goats metabolize anthelmintic drugs much faster in their liver, meaning they require roughly 2× the cattle dose of fenbendazole or ivermectin to achieve therapeutic blood levels.

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