Hidden dangers of winter parasites in livestock

Winter is here, and farmers often wonder about the impact of parasites on their livestock during the colder months. While many assume that winter brings a respite from these pesky problems, parasites remain a concern even when temperatures drop.

In this episode, we delve into the critical questions surrounding parasite management in winter with Dr Caryn Shacklock, Howick laboratory manager for Afrivet Technical and Training Services.

Shacklock says, “Many farmers look forward to the first frost, hoping it will bring relief from the parasites prevalent in summer. However, it’s essential to remember that winter doesn’t mean any parasites; it merely means reducing their activity. While the colder months do reduce parasite visibility and activity, they don’t eliminate the problem.”

It is a common misconception that parasites disappear in winter. Instead, many parasites lie dormant or overwinter, waiting for favourable conditions to resume their life cycle. While you may not see as many engorged ticks on your cattle and sheep, the threat is far from gone.

Winter parasites to look out for

Shacklock says when it comes to external parasites, ticks become less visible in winter as they are immature. However, they are still present and can resume activity in spring. “Mites and lice, on the other hand, thrive in cooler conditions, so sheep scab or itch mites can be issued for sheep and goats,” she says.

Regarding internal parasites, regions with winter rainfall face ongoing challenges with worms like the brown stomach worm and bankrupt worm, particularly in sheep.

“Liver and conical flukes also pose a problem as their intermediate host, the snail, becomes inactive in cold temperatures, allowing flukes to mature inside the livestock. This can lead to significant issues when spring arrives,” she explains.