Age-Related Parasites: Scourges of Foals and Young Horses

How do you ensure that parasites have the minimum impact on your horse’s health and well being? Let’s start with young horses, because parasite populations in immature animals are often quite different than those found in adults. Weanlings and yearlings on pasture are particularly susceptible to parasitic disease. Some kinds of worms prefer young horses so strongly that they’re almost never found in equines past a certain age. Because of the age distribution of these worms, parasite control recommendations for immature animals are different than for adults. Infections with threadworms, roundworms and pinworms, for example, are found almost exclusively in horses less than six months, 18 months, and 24 months old, respectively.

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