How To Tell If Goats Have Worms: The FAMACHA Scoring And Clinical Assessment Guide

Identifying internal parasite loads in goats requires a combination of visual clinical assessments, specifically the FAMACHA system, and fecal analysis to avoid catastrophic production losses or mortality. By monitoring mucous membrane color, body condition scores, and fecal consistency, owners can accurately determine when deworming intervention is biologically necessary to prevent anthelmintic resistance.

Foundational Parasite Management and Assessment Tools

Managing internal parasites in goats is primarily a battle against Haemonchus contortus, or the barber’s pole worm, which feeds on the host's blood. Because this parasite thrives in warm, humid climates, goat owners must maintain a proactive diagnostic routine rather than relying on blanket deworming, which accelerates drug resistance.

• Essential Assessment Tools:
• FAMACHA eye charts (official cards issued by the American Consortium for Small Ruminant Parasite Control).
• Body Condition Scoring (BCS) guide (1-5 scale).
• Clean microscope slides and coverslips (for fecal egg counts).
• Fecal float solution (saturated sugar or sodium nitrate).
• Centrifuge (optional, for McMaster fecal egg count techniques).
• Sturdy record-keeping log to track individual animal scores over time.

Prerequisite Knowledge:

• Understanding the lifecycle of the barber's pole worm (approx. 21 days).
• Ability to recognize normal versus pale conjunctival tissue.
• Knowledge of rotational grazing standards to minimize larval ingestion.
• Duration: 5-10 minutes per animal for routine screening.

Clinical Workflow for Internal Parasite Detection

Step 1: Performing the FAMACHA Eye Examination

The most critical visual indicator of a high parasite load is anemia. To assess this, stand to the side of the goat and place your hand over its head to cover its eyes from direct sunlight. Use your thumb to push down on the upper eyelid and your index finger to push up on the lower eyelid, effectively rolling the lower eyelid downward to expose the inner lining (conjunctiva).

1. Compare the color of the exposed membrane against the official FAMACHA chart.
2. Category 1 (Red/Healthy) indicates no anemia; Category 5 (White) indicates severe, life-threatening anemia.
3. Categorize the animal. Only treat individuals scoring 4 or 5, or those scoring 3 if the animal shows additional clinical symptoms of distress.

Pro-Tip: Do not rely on color charts printed on standard paper, as printer variances make them inaccurate. Obtain a laminated, official FAMACHA card to ensure correct diagnostic lighting and color calibration.

Step 2: Evaluating Body Condition Scores

Goats suffering from chronic worm burdens often display a "bottle jaw"—an accumulation of fluid under the jaw—or general emaciation. Use the Body Condition Scoring (BCS) system by palpating the lumbar area and the sternum.

1. Feel for the spine and the transverse processes of the lumbar vertebrae.
2. If the processes are sharp and the goat lacks fat cover over the ribs, the animal is in a BCS 1 or 2.
3. Rapid weight loss in a goat that is consuming adequate forage is a classic secondary symptom of gastrointestinal nematodes.

Step 3: Assessing Fecal Consistency and Presentation

While scouring (diarrhea) is a common symptom of coccidiosis or worm infestation, the absence of diarrhea does not guarantee a parasite-free animal. Haemonchus contortus specifically causes anemia rather than overt diarrhea.

1. Observe the fecal pellets; they should be firm and uniform.
2. If pellets are clumped or excessively watery, note the individual’s identification.
3. Collect fresh fecal samples directly from the rectum if you suspect a high load, as aged samples from the ground will be contaminated by soil organisms.

Step 4: Quantitative Fecal Egg Count Testing

Visual inspection should be validated by McMaster egg counts to determine the level of shedding.

1. Mix two grams of feces with 28 milliliters of floatation solution.
2. Strain the mixture to remove large debris.
3. Load the McMaster slide chambers.
4. Count the eggs under a microscope at 100x magnification.
5. Multiply the count by 50 to get the eggs per gram (EPG) measurement.

Warning: Never use a single deworming agent repeatedly. If your EPG counts remain high after treatment, you are likely dealing with anthelmintic resistance, and you must rotate chemical classes (e.g., switching from Ivermectin to Moxidectin or Fenbendazole).

Parasite Threshold and Diagnostic Metric Reference Table

Field Troubleshooting for Persistent Parasite Issues

• Root Cause: Ineffective Dewormer Application.
  
  
  • Actionable Fix: Ensure you are dosing based on the animal’s exact weight using a digital livestock scale. Under-dosing is the primary driver of drug resistance; treat for the heaviest goat in the group to avoid sub-therapeutic levels.
• Root Cause: High Pasture Contamination.
  
  
  • Actionable Fix: Implement a rotational grazing strategy where goats are moved to fresh pasture every 7-10 days, allowing the old pasture to rest for at least 60 days to break the parasite life cycle.
• Root Cause: Ignoring Sub-Clinical Carriers.
  
  
  • Actionable Fix: Practice "selective culling." Identify the "10% of animals hosting 90% of the worms" in your herd and remove them from the breeding program to naturally select for parasite-resistant genetics.

Frequently Asked Questions

Is it normal for goats to have some worms?

Yes, it is impossible to maintain a parasite-free herd. A low level of infection is considered normal; the goal is to manage the population so that the goat's immune system can keep the worm load at a level that does not affect health or production.

How often should I check my goats for worms?

During the high-risk, warm, and humid season, check your goats using the FAMACHA system every 14 to 21 days. In cooler, drier seasons, you may be able to stretch assessments to once every 30 to 45 days.

Can I see worms in goat poop without a microscope?

It is extremely rare to see adult worms in goat feces. If you see visible worms, the animal has a massive, advanced-stage infestation, and you must consult a veterinarian immediately, as standard dewormers may not be sufficient to save the animal.

Does apple cider vinegar or herbal remedies prevent worms?

There is no scientific evidence to suggest that apple cider vinegar, garlic, or other herbal supplements effectively control heavy nematode infestations in goats. Relying solely on these methods often leads to severe anemia and death.

Establish a disciplined monitoring regimen today to ensure the longevity and productivity of your herd. Contact a local large-animal veterinarian to develop a Targeted Selective Treatment plan tailored to your specific regional parasite challenges.