CAE Antibody Test – An Often Overlooked Tool in Goat Herd Health

So here's a real story. A friend of mine who raises goats – let's call him Dave – had two kids go down one winter. Just wobbly. Heads tilted a little. Vet came out and said, "might be CAE." Dave just stared at him. What the heck is CAE?

Turned out half his herd tested positive. Those two kids didn't make it.

CAE stands for Caprine Arthritis-Encephalitis. Fancy name, I know. But here's what you actually need to know: it's a slow virus. Means it doesn't rush. A goat can catch it today and look totally fine for a year. Maybe two. You won't know anything's wrong until one day you notice – huh, that doe's walking a little stiff. Or why did that doe's milk drop so much?

By the time you see it, the virus has already been moving around your herd quietly.

That's why people who've been doing this for a while don't wait for the goat to look sick. They test. And the test is simple – draw some blood, send it to a lab, and they check if the goat has made antibodies against CAE.

What the test actually tells you

You know how your body makes antibodies when it fights off a bug? Same thing with goats. The test just looks for that "memory" in the blood.

Antibodies present → goat got exposed at some point → can pass it to others

No antibodies → goat's clean for now

That's really all there is to it.

So you get a positive. Now what?

Don't panic. Seriously. A positive doesn't mean you need to shoot the goat tomorrow.

But you do have to do two things. No shortcuts.

First – and this is the big one – her babies cannot drink her milk. That's how most kids get it. Pull the kids right at birth. Feed them heat-treated colostrum from a clean doe, or use replacer. That alone stops most of the spread.

Second – keep your positive goats away from your negatives. Separate pens if you can. Don't let them share water buckets or feed troughs.

My friend Dave did exactly that. First year, every positive doe's kids got pulled and bottle-fed. Tested again the next year – numbers dropped. Three years later, his herd was basically clean. It's not fast, but it works.

Who should actually bother testing?

Look, if you've never tested before, just do it once this year. Especially if:

You just bought new goats. I don't care how nice the seller was. Quarantine them and test before you mix them in.

You've seen swollen knees or weird walking in your herd. Don't just guess it's an injury.

You run a dairy herd. CAE spreads more in dairy because of how you feed milk to kids.

How often?

Once a year is plenty to start. Test before kidding season – that way you know ahead of time which moms are safe and which ones you need to pull kids from.

If you go two years in a row with all negatives, and you're not dragging in outside goats without testing, you can probably test less often. But don't drop it completely.

One last honest thought

I didn't know about CAE when I first started with goats either. I thought if a goat was limping, she just stepped on something. Thought if a kid was wobbly, maybe it was born weak. Took a hard lesson to wake me up.

Testing isn't expensive. Losing a whole batch of kids is. If you haven't tested before, just pick your best three or four does and send in their blood. See what comes back.

If they're all negative – great, sleep easy.
If you get a positive – now you know. And knowing beats guessing every single time.

That's all I got. Talk to your large animal vet if you're not sure where to send samples. They'll know a lab.

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