Deworming Chemical Chart Protocols for Foals Dairyland Veterinary Service Chemical Class Drug Name Brand Name Dr. Matt Schaefer Macrocylic Ivermectin Zimectrin Foals to 1 year old Lactones Rotectin 1 920-837-7766 Equimectrin 2 months Strongid Eqvalan 4 months anthelcide Ivercide 6 months ivermectin FEC at least 2x after ERP 8 months Strongid Moxidectin Quest 10 months anthelcide Pyrimidines Pyrantel pamoate Strongid Paste 12 months Ivermectin Rotectin 2 Pyrantel tartate (daily) Strongid C Yearlings 1-3 years old Strongid C2X Equine Deworming Pyrantel tartate (single Manna Pro, April FEC Ivermectin or Moxidectin dose) Kaeco Protocols Benzimidazoles Fenbendazole Safe-Guard July Benzimidazole or Pyrimidine Panacur Procedures August Ivermectin Oxibendazole Anthelcide October FEC Praziquantel / Fenbendazole Oxifendazole Equi-cide, or Benzilmin Praziquantel / Ivermectin Pyrozine Praziquantel Equimax or (Ivermectin) Praziquantel / Moxidectin Zimectrin Gold (Ivermectin Quest Plus (Moxidectin)

Dairyland Veterinary Service Dr. Matt Schaefer

310 Main St. Casco, WI Phone: 920-837-7766 Fax: 920-837-7303 E-mail: [email protected] www.dairylandvet.net Tel: 920-837-7766 Classification Scheme and With this in mind, the only way to reduce Deworming Protocol for Mature Horses Deworming Protocol worm eggs once deposited on pasture is by frequent manure removal (before they hatch APRIL FECAL TEST ALL HORSES into infective larvae within 4-7days) or

Low Shedder Moderate Shedder High Shedder harrowing during hot, dry periods with no (<200 EPG) (200-500 EPG) (>500 EPG) horses on the pasture. This will kill the eggs by drying them out. Unfortunately, there is no After many decades of rotational deworming such thing as a killing frost, eggs just remain APR Deworm Deworm Deworm protocols, very important observations with dormant during the winter and will hatch in the (Ivermectin) (Moxidectin) (Moxidectin) serious consequences have been made. spring when the warm moist conditions return. 1. Widespread drug resistance is well JUL None Benzimidazole Benzimidazole It is important not to drag pastures late fall &/or &/or documented in current equine parasite because this will only spread eggs to hatch in Pyrimidine Pyrimidine (small strongyles) populations. different places in the late spring. 2. There are no new chemical classes of None None Ivermectin AUG dewormers being developed.

3. Not all horses, due to their genetic

resistance, carry significant amount of

worms. So Where Do We Start? OCTOBER FECAL TEST ALL HORSES, then

With this knowledge and it’s potential GIVE YEAR END TREATMENTS consequences, a new deworming protocol has By collecting fecal samples... been developed. This new protocol is based on Collect freshly passed feces that are uncon- Moxidectin Ivermectin Ivermectin the natural resistance of the individual horse as Praziquantel Praziquantel Praziquantel determined by a bi-annual fecal egg counts taminated by soil or bedding. Two or Three (FEC) test. After this is done, it is important to fecal balls can be picked up off the ground if appropriately use the correct dewormers and done soon after deposited. The collection NOTE: Before fecal testing it is important to observe properly manage the pasture and keep the container should be labeled with the name (number) of the animal and the date of the Egg Reappearance Period (ERP) after each class environment as clean as possible. When of wormer is given in order to get accurate results. possible, it is important to observe a common collection. Fresh samples work best, but rule of 1000 lbs. of horse per 2-4 acres of accurate results can be obtained if the sample pasture. This is what is known as the stocking is kept refrigerated (3 days maximum). After rate. this, eggs will disintegrate or hatch and cannot FECAL TEST TIMING Stocking rate, as it pertains to parasite burdens, be counted. can greatly influence transmission of new Benzimidazole or Pyrimidine : infections to horses introduced into a pasture. Test 4 weeks after dewormer is given The number of horses in a given area contribute Ivermectin : worm eggs which in a few days hatch into Test 6-8 weeks after dewormer is given infective larvae under warm and moist Moxidectin : conditions. The infective larvae will cling to Test 12 weeks after dewormer is given blades of grass and are consumed when the horse grazes.