“In general,” Dr. Sheaffer says, “most parasitic conditions can be addressed best with a natural wormer, used between the new and full moons.” Dr. Sheaffer cites a North American research trial using 14,000 certified organic laying hens, some of which had heavy worm loads (ascarids, large tape and round worms). The hens were started on a therapeutic treatment for seven days, beginning on the new moon. “At the end of the trial, there was a 24% reduction in roundworms, and a 90% reduction in tapeworms, using homeopathic plant remedies added to the chickens’ drinking water. It appeared, from this trial, that tapeworms were also more susceptible to herbal wormers than roundworms.” Field trials with horses, he said, suggest a similar pattern.

“The strongyle family of parasites seems to respect the lunar cycle,” he says. “I think the female worm ovulates between the new and full moons. Wormers given at this time may disrupt her egg-laying cycle. So, if you can disrupt the full, 7- to 14-day, egg-laying cycle, you can disrupt strongyles.”

Attention to lunar cycles is also important to fecal samples, Dr. Sheaffer says. “We can’t get lulled into a false sense of security with fecal counts.” The most successful assessments collect fecal samples between the 1st and 15th of the month (from the new-to-full moon phases, when parasite egg-laying is at its peak). Samples taken between the 15th and 30th of the month may not show eggs because it may not jibe with a parasite egg-laying cycle. “Daily fecals, and quantitative egg counts could perhaps best document this cycle in an individual horse.”

In addition to planning your worming program between the new and full phases of the moon, Dr. Sheaffer advises alternating between homeopathic and herbal wormers, used several times a year. “A homeopathic preparation is one that has been harvested and then soaked in distilled water and grain alcohol before being cold-processed into a mother tincture. This tincture can then be diluted into the finished, homeopathic product that retains its medicinal value but reduces the potential side effects of the main ingredients.”

A good rule of thumb is to start a worming program in April with the first spring grass, in harmony with the new-to-full moon phases. Follow up with a fecal count in May, and treat again if necessary in June. The next worming can be in October, with a fecal count taken in November, and a re-treatment again in December if necessary.