Baby goats (kids) generally become vulnerable to internal parasites after about one month of age, and fecal monitoring should begin around six weeks. Rather than deworming on a fixed calendar, the current best practice is to treat individual kids only when they show signs of a worm burden. This approach protects your kids while slowing the development of drug-resistant parasites on your farm.
When Kids Become Vulnerable
Gastrointestinal roundworms generally don’t infect kids until they’re over a month old. Before that, kids are mostly consuming milk and have minimal contact with contaminated pasture. Once they start nibbling grass and browsing, they begin ingesting parasite larvae from the soil and forage.
Starting at six weeks of age, collect fecal samples every three weeks to check for roundworm eggs. This gives you a baseline and tells you exactly when parasites are building up, rather than guessing. A veterinarian or livestock lab can run a fecal egg count for a few dollars per sample, and many goat owners learn to do it themselves with an inexpensive microscope.
Coccidiosis: The Bigger Threat for Young Kids
Before roundworms become an issue, coccidia are the parasite most likely to make your kids sick. Coccidia are single-celled organisms (not worms) that damage the intestinal lining, causing watery or bloody diarrhea, dehydration, and poor growth. Most clinical cases hit between five and eight weeks of age, when kids ingest large numbers of coccidia from contaminated bedding, water, or soil over a short period.
Weaning makes things worse. The stress of separation suppresses a kid’s immune system, and coccidiosis often flares right around that transition. In herds with a known history of coccidia problems, a preventive feed additive can be started before the risk window and continued from four weeks before weaning through three weeks after. This covers the most dangerous period without requiring individual treatment unless a kid gets visibly sick.
Keep bedding dry, feeders off the ground, and water sources clean. Coccidia thrive in cool, damp conditions, so good sanitation in the kidding area and early housing goes a long way.
Why You Shouldn’t Deworm on a Fixed Schedule
Whole-herd deworming on a calendar (every 30 days, every season) is outdated advice that has created widespread drug resistance in goat parasites. The American Consortium for Small Ruminant Parasite Control now recommends targeted selective treatment: deworm only the individual animals that actually need it, based on clinical signs or diagnostic results.
The reasoning is simple. On any farm, a portion of the parasite population has never been exposed to dewormers. These drug-susceptible worms are called “refugia,” and they dilute the resistant ones. When you deworm every animal at once, you kill off the susceptible worms and leave only resistant survivors to reproduce. Within a few generations, your dewormers stop working. By treating only kids that show signs of a heavy burden, you keep that pool of susceptible parasites alive on your pasture, which preserves the effectiveness of your drugs for the animals that truly need them.
How to Tell Which Kids Need Treatment
The most practical on-farm tool for detecting the barber pole worm (the most dangerous blood-sucking parasite in goats) is the FAMACHA eye score. You pull down the lower eyelid and compare the color of the mucous membrane to a standardized card with five color blocks.
- Score 1: Deep red. Healthy, no treatment needed.
- Score 2: Red-pink. Still healthy, no treatment needed.
- Score 3: Pink. A judgment call. Young, thin, or stressed kids at this score should be treated. Older, healthy animals can be rechecked in a week.
- Score 4: Pink-white. Anemic, treat promptly.
- Score 5: White. Severely anemic, treat immediately.
Goats tend not to reach the deepest red of score 1 the way sheep do, so a score of 2 is your typical “all clear.” Check kids every one to two weeks during grazing season, especially after weaning or during wet weather when larvae thrive on pasture.
Beyond FAMACHA, watch for a rough coat, poor weight gain, a swollen jaw (called bottle jaw, a sign of severe anemia), or persistent diarrhea. Any of these paired with a high fecal egg count or a FAMACHA score of 3 or higher warrants treatment.
How to Deworm Effectively
When a kid does need treatment, the current recommendation is to use a combination approach: administer the most effective drug from each dewormer class, given orally, one right after the other (not mixed together), at the full dose based on weight. Underdosing is one of the fastest ways to breed resistant worms, and goats metabolize dewormers faster than sheep or cattle, so the cattle label dose is often insufficient. Work with a veterinarian familiar with small ruminants to confirm appropriate dosing for your situation.
Weigh your kids before dosing. Eyeballing weight is unreliable, especially with young, fast-growing animals. A bathroom scale works fine for small kids: step on holding the kid, then subtract your own weight.
Copper Oxide Wire Particles as a Supplement
Copper oxide wire particles (COWP) are small copper rods given in a capsule that lodge in the stomach and slowly release copper, which is toxic to barber pole worms. Research published in the Journal of Animal Science found that a dose as low as 0.5 grams reduced fecal egg counts in weaned kids for up to three weeks, while 4 to 5 grams was effective in mature goats.
COWP isn’t a replacement for chemical dewormers in a kid with a heavy burden, but it can be a useful addition to your parasite management toolkit. Copper toxicity is a real risk in goats (especially dairy breeds), so don’t use COWP without knowing your herd’s copper status through liver or blood testing first.
Pasture Management Reduces Worm Exposure
Parasite larvae hatch from eggs deposited in manure and climb onto grass blades, waiting to be eaten. Rotational grazing breaks this cycle by moving animals off a paddock before larvae become infective and giving the pasture enough rest time for larvae to die off.
In temperate climates, a rest period of more than 65 days is recommended to significantly reduce larval contamination. In warmer regions, where larvae don’t survive as long, a 35-day rest period is effective. A practical setup divides your total pasture into about 10 paddocks, grazing each for roughly 3 to 4 days before rotating. This naturally gives each paddock over a month of rest.
Other strategies that help: keep grass height above 4 inches (larvae concentrate in the lowest 2 inches), avoid overcrowding which forces kids to graze close to manure, and provide browse or elevated feeders. Kids raised on dry lots or with minimal pasture exposure will have lower worm burdens but may still face coccidia if sanitation is poor.
A Practical Timeline for Kid Parasite Management
From birth through about four weeks, kids are at low risk for roundworms but should be in clean, dry housing to minimize coccidia exposure. Between four and six weeks, begin preventive coccidiosis management if your herd has a history of problems. At six weeks, start fecal egg count monitoring every three weeks and begin regular FAMACHA scoring.
Around weaning (typically 8 to 12 weeks, depending on your management), watch closely. The stress suppresses immunity, and this is when both coccidia and roundworm burdens tend to spike. Treat individual kids based on their scores and fecal results, not the whole group. After weaning, continue monitoring through the first grazing season. Kids in their first year on pasture are the most susceptible animals in your herd because they haven’t yet developed immunity from repeated low-level exposure.