How long after calving can a cow be dewormed?
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Expert Answer
Generally deworm a cow 20 to 30 days after calving, with staged gastrointestinal and subcutaneous external deworming. Calves start at about 2 months, or sooner with signs like teeth grinding or tucked tail.
Calves have immature immunity and weak parasite resistance, so deworm promptly once infected to protect growth.