The Poop on Dung Beetles

Troy Bishopp (the Grass Whisperer and On Pasture author) says that if he comes to visit your pastures, one of the first things he’ll look at are the manure pats. Why? Because they can tell him a lot about the quality of what the cattle are eating, how often they’re being moved, and even where they like to hang out. They can also tell him if you’ve got beneficial insects that are helping you manage pests. Yep, Troy will be looking for those signs that you’ve got dung beetles.  In fact, the more I learn about these little bugs, the more time I spend looking at poop too!

Here’s what dung beetles do for us:

Reduce Fly Problems

horn-fly2Horn flies (Haematobia irritans) and face flies ((Musca autumnalis) both need manure pats to breed and incubate. Dung beetles destroy manure pats so that the flies have no place to party and their larvae have no where to live. Some research has found a 95% decrease in horn flies thanks to dung beetles. That’s a big deal when you consider that horn flies can cause a 15 to 50 pound reduction in calf weaning weights. Some researchers estimate that farmers and ranchers spend $60 million a year on controlling insects. So next time you see a dung beetle, thank it for helping save you money. (And for our Australian readers, dung beetles are reported to reduce bush flies by as much as 90%!)

Make More Forage Available to Your Livestock

Since livestock poop where they eat, that can mean that from 5 to 10% of the forage in a pasture is covered with manure and won’t be eaten. That’s not a lot but when your margins are slim, every little bit counts. Of course, you might also look at as forage that’s being trampled and returned to the soil, and in that case it’s all good.

Put Nitrogen in Your Soil

All that fertilizer that your livestock are scattering on pasture, and maybe even laying out in a more concentrated fashion with management intensive grazing, is a great start to improving the fertility of your soil. But you need dung beetles to complete the cycle. If left on the surface, 80% of manure nitrogen can be lost into the atmosphere. Dung beetles reduce that loss by quickly incorporating manure into the soil by rolling it up and hauling it underground, thus incorporating nitrogen into the soil. The dung beetle’s plan for those little poop pills is that they will feed its larvae.  But the larvae use only 40-50% of the brood ball. The rest of that nutrient-rich organic matter is left behind for soil microbes, fungi and bacteria to use for creating humus. Between the nitrogen, the tunnels that increase soil’s water-holding capacity, and the addition of organic matter to your soil, those little dung beetles are doing a lot of good work for you!

Adding Dung Beetles to Your Pastures

It’s likely that you have dung beetles already, though you may not have as many as you’d like. You can increase their numbers by changing the way you currently manage for parasites in your herd. Reduce your insecticide use, and keep in mind that Ivermectin can reduce dung beetle survival. Research has shown that the injectable version reduces dung beetle survival for 1 to 2 weeks, and the pour-on reduces survival of larvae for 1 to 3 weeks. The bolus version is most harmful to dung beetles, with effects lasting as much as 20 weeks.

We found the following websites where you can purchase dung beetles do add to your pastures.

United Kingdom: Dung Beetles Direct

Australia: Dung Beetle Expert and Dung Beetle Solutions

United States: Dung Beetles

Keep in mind that it may be possible for dung beetles from one part of the country to bring pathogens with them. So it may be a safer bet to collect dung beetles locally.  Here are instructions for capturing and moving dung beetles from Rincon-Vitova Insectaries. Check out their web page for additional information about monitoring your pastures for dung beetles.

How to catch dung beetles

There are THOUSANDS of species of dung beetles, so we can’t tell you what you might have in your area. Your best bet is to talk to a local entymologist or someone from your local extension, or Conservation District office. But, to give you a start for your first tour of your pasture, here are examples of dung beetles found in North Carolina. Thanks to the folks at North Carolina State University for these pictures and their fact sheet.

Click on picture to see a full size version.
Click on picture to see a full size version.

True Facts About the Dung BeetleWant even more? Here are two great, short videos about Dung beetles. The first one in the article is my favorite! 🙂

3 thoughts on “The Poop on Dung Beetles

  1. Very interesting,but I just wonder how dung beetle survival after giving Ivermectin or similar Rx to an animal (or group thereof) is measured. Must be all done in laboratory? So n beetles(or their larvae?) per holding jar are given the drug, presumably mixed into poop?,and then counted until all die? But that’s hardly relevant to their mortality in pasture with treated cattle?

    1. I would guess that the method you’re surmising is not how they determine mortality rates. The folks doing this are scientists, like you, and thus certainly know techniques that would give them realistic numbers. If you really want to know how they figure this I’m sure we can find it with a quick search of the Internet.

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