I read your web page with interest on worming with the lunar cycles and as I am just about to start a targetted worming programme at our livery yard I thought we would start in July. With new moon on 8th July and full moon on 22 July, I wondered what your recommended day in the lunar cycle would be best to administer a one-dose wormer (for those horses needing one after a faecal egg count)? Also we envisage taking the faecal worm count about one week beforehand.
Susan Barker, Shrewbusy, Shropshire UK
Worming, whether by chemical or alternative methods, is best done around the full moon. According to research, parasites are more active during a Full Moon and therefore easier to dislodge. You will be able to have a higher rate of kill because parasites are suspended and the worms detach from the walls of the organs and lining of the intestine to breed and lay eggs, so they are vulnerable at that time.
In the article you reference, Dr. Sheaffer suggests starting a worming program in April with the first spring grass, in harmony with the new-to-full moon phases. So if you can, you may want to start your new program with the next cycle starting in May if you can. Taking your fecal count one week before is a great idea...assuming it is done within the first few days of the month before the new moon.
Hope this helps. Keep us posted on Facebook and let us know how you make out. Good Luck!