There is no such thing as a killing frost for these parasites.” When these conditions exist during the year depends on location but one thing we know is that eggs actually survive much better in cold than hot conditions. Martin Nielsen, DVM PhD, a leading researcher in equine parasitology, and assistant professor at the University of Kentucky Gluck Equine Research center says: “In the environment, parasite eggs flourish and develop into infective larvae when temperatures are between 45° and 85° Fahrenheit. The infective larvae mature within the horse into adult worms, and the cycle repeats itself. The larvae develop to a point at which they are “infective” and are once again ingested by a horse. On pasture, the eggs hatch over time into larvae. These eggs are passed from the horse into the environment in the manure. The adult worms live in the intestine of the horse, where they lay their eggs. They all spend part of their lives in the horse, and part of their lives in the environment. While there are great differences among the important internal parasites, they share a fundamentally similar life cycle. In order to be part of the solution to the resistance problem, and at the same time to give your horses the best care, it is important that you know the basic characteristics of the common equine parasites, as well as the basic mechanism and effects of the common deworming compounds. But when it comes to equine parasite control, controversy and confusion remains, and there are still many people still “doing it the old way”.
This approach reduces the total amount of chemical used and better matches drug to worm.
Because of this, “targeted deworming” based on fecal analysis results has become the industry standard. Research over the past 10 years has confirmed that indiscriminate deworming leads to selection for worms resistant to common deworming compounds.
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