Enter your last deworming date and treatment interval to generate the next 4 scheduled deworming dates. Export to your calendar as an ICS file for automatic reminders.
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Load example deworming planner data to see the full workflow
Typical: every 4-6 months for sows; every 6 months for gilts and boars.
Deworming intervals are general recommendations based on commercial swine management guidelines. Actual protocols should be tailored to your herd's parasite burden, production stage, and anthelmintic resistance profile by a licensed veterinarian.
When to use
Do not use for
Deworming sows 2–3 weeks pre-farrowing reduces the parasite burden before the periparturient rise in egg shedding, protecting piglets from early-life infection. Post-farrowing treatment is less effective at breaking the transmission cycle.
Using the same anthelmintic product year after year selects for resistance. Rotate between macrocyclic lactones (ivermectin, doramectin), benzimidazoles (fenbendazole), and levamisole on an annual schedule.
Just because you gave the drug does not mean it worked. Run a fecal egg count reduction test periodically to confirm your program is reducing parasite burdens. Treatment compliance without efficacy monitoring is a false sense of security.
Deworming dates are computed by adding the user-specified interval (in months) to the last treatment date, repeated for 4 future treatment cycles. ICS events are generated per RFC 5545 specification and include treatment notes. All calculations are performed client-side. No data is stored or transmitted.
Last validated 2026-04-08. Calculations are designed for planning and documentation support; verify procurement decisions against manufacturer specifications or institutional SOPs.
ConductScience Swine Deworming Reminder Planner (v1.0). ConductScience, Inc. 2026. Available at: https://conductscience.com/tools/swine-deworming-planner
Roepstorff A, Mejer H, Nejsum P, Thamsborg SM. Helminth parasites in pigs: New challenges in pig production and current research highlights. Veterinary Parasitology. 2011;180(1-2):72-81. doi:10.1016/j.vetpar.2011.01.030
National Pork Board. Swine Care Handbook. NPPC, 2021.
Internal parasites impose significant but often underestimated costs on swine operations. Subclinical *Ascaris suum* infection — the most common swine parasite — reduces average daily gain by 5–15% and causes "milk spot" liver condemnations at slaughter, both reducing profitability without obvious clinical signs.
*Ascaris suum* eggs passed in feces become infective larvae in soil within 3–4 weeks (under favorable conditions). Larvae are ingested, migrate through the liver and lungs ("swine influenza-like syndrome" in heavy infections), and mature in the small intestine. The prepatent period is 6–8 weeks.
Effective treatment requires reaching migrating larvae *and* adult worms — most anthelmintics target adults; ivermectin and macrocyclic lactones have broader activity against larvae.
A robust swine parasite control program goes beyond calendar-based deworming. The following framework is recommended by veterinary parasitologists:
Reference protocol for the next planning step.
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