Why Vet-Guided Drenching Is Essential for Calf Health and Growth
September 2025

Why Vet-Guided Drenching Is Essential for Calf Health and Growth

With a wide range of drenches available on the market, choosing the right one for your calves isn’t just a matter of preference—it’s a critical decision that can significantly impact their health, growth, and long-term productivity.

The Impact of Worm Burden on Calves

Drenching plays a vital role in calf rearing. Worm infestations can reduce growth rates by up to 30%, primarily due to appetite loss and poor nutrient absorption. Common symptoms include:

  • Scouring
  • Poor coat condition
  • Coughing (indicative of lungworm)
  • Stunted growth
  • In severe cases, sudden death

Unchecked worm burdens can escalate into serious conditions such as parasitic gastroenteritis, bronchitis, or pneumonia—especially when lungworm is involved.

Young Calves Are Especially Vulnerable

From weaning through to around 15 months of age, calves are particularly susceptible to parasites. Their immune systems are still developing, leaving them less equipped to fight off infections. This makes early and effective parasite control essential.

Why Drench Quality Matters More Than Cost

When it comes to young stock, quality should never be compromised. High-quality drenches are backed by:

  • Rigorous research and field trials
  • Proven efficacy across parasite life stages (not just adults)
  • Strict manufacturing standards

In contrast, cheaper drenches may result in:

  • Underdosing or poor efficacy
  • Incomplete parasite control
  • Accelerated resistance development
  • Reduced growth and performance

Saving a few dollars upfront can lead to long-term losses in productivity and animal health.

The Value of Veterinary Advice

Purchasing your drench through your veterinarian ensures you receive expert, tailored guidance. Vets consider:

  • Stock class and age
  • Regional parasite pressure
  • Weight ranges and dosing accuracy
  • Pasture management and stocking rates

They can also help you:

  • Select the right product at the right time
  • Design a strategic drench rotation plan
  • Implement and interpret faecal egg counts
  • Recommend dual or triple-active drenches when needed

Protect Your Investment and Prevent Resistance

Veterinary support is not just about choosing a product—it’s about building a sustainable parasite control strategy. This is crucial for:

  • Preventing drench resistance
  • Ensuring optimal animal health
  • Maximizing growth and productivity