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Dung beetles reduce survival of livestock parasites

Dung beetle activity dries cow pats out rapidly, leading to parasitic larvae death.

Scientists from the University of Bristol in the U.K. have found that dung beetles can help farmers by reducing the development and survival of parasites in cowpats that cause serious illness in cattle during the summer months.

The study was led by doctoral student Bryony Sands from the School of Biological Sciences and was published Nov. 17 in the Journal of Applied Ecology.

Artificial cow pats were made using feces collected elsewhere and were manipulated by adding dung beetles and varying simulated rainfall. After two weeks, parasitic larvae were taken from vegetation surrounding the cow pats.

The numbers of parasitic larvae found on vegetation around pats increased over the first six weeks, and remained high for at least 10 weeks.

At first, there were more parasites found around pats that were colonized by dung beetles as opposed to un-colonized pats.

However, after eight weeks, fewer parasitic larvae were found around pats that were colonized by dung beetles. This pattern persisted for the rest of the 10 week experiment.

Increased rainfall was achieved by periodically watering the pats. This led to more parasitic larvae being found on the pasture, suggesting that reduced development and survival of livestock parasites as a result of dung beetle activity can be overridden by heavy rainfall.

It was suggested that dung beetle activity ventilates cow pats, providing the right initial conditions for parasite egg hatching.

However, parasite survival was reduced overall in pats with more beetles. Larvae require moist conditions, and dung beetle activity dries cow pats out rapidly, leading to parasite death. On average, almost 200 insects naturally colonized each cow pat, including 20 Aphodius dung beetles, which permanently live within dung.

"Dung beetle conservation is vital for the welfare of our farm animals," Sands said. "The conservation of dung beetles on farmland today is extremely important for their role in dung degradation, nutrient cycling, pasture fertility, and because now we have seen that they can contribute to reducing economically deleterious livestock parasites on farms.

"These beetles may be important in cow welfare, as cows are severely affected by parasites found in their intestines," he added.

Current control against parasites involves feed-through insecticides that the cows do not fully digest, resulting in contaminated cow pats.

Sands added, "These pats are toxic to dung beetles, even though these critters may provide natural control against the same parasites the chemicals are fighting. Controlling parasites is expensive, and these beetles could provide a natural way to keep cows worm-free."

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