Weaning Calves: Key Considerations for Waikato & King Country Farmers
August 2025

Weaning is a pivotal stage in calf rearing that directly influences lifetime performance. For farmers across Waikato and King Country, successful weaning requires more than just removing milk—it demands careful attention to nutrition, rumen development, parasite control, and stress management.

1. Age vs. Weight – Don’t Rush It

Weaning should be based on liveweight and rumen development, not age alone.

  • Target weight: 80–100kg, depending on breed
  • Meal intake: At least 1kg/day for several weeks before milk removal

2. Rumen Development Is Essential

High-quality calf meal or pellets rich in starch and protein stimulate rumen papillae growth, improving nutrient absorption.
Ensure calves are confidently eating pasture and meal before weaning.

3. Choose Quality Calf Meal

Look for:

  • Around 20% protein
  • Balanced energy and minerals
  • Fresh, palatable feed to encourage intake

4. Always Provide Clean Water

Water is vital for rumen function and overall calf health.
Ensure constant access to clean, fresh water.

5. Parasite Control Post-Weaning

Calves are highly susceptible to worm burdens after weaning.

  • Implement a drenching plan
  • Monitor growth rates
  • Use faecal egg counts at your local Vetora clinic if parasitism is suspected

6. Offer High-Quality Pasture

Young calves need leafy, high-energy pasture—not mature or fibrous grass.
This supports continued growth and development.

7. Minimise Stress

Handle calves calmly and keep groups stable.
Avoid weaning during poor weather or feed shortages.

8. Monitor Growth Regularly

  • Target growth: 0.7–0.8kg/day
  • Use regular weighing to identify slow growers early and intervene as needed

Take-Home Message

Successful weaning is about more than just removing milk.
Balancing nutrition, parasite control, and stress management—along with proper weight and rumen readiness—ensures calves transition smoothly and continue on a path to strong lifetime productivity.

Well-grown heifers make well-grown cows.

Supporting Farmers Across Waikato & King Country

Whether you're farming in Te Awamutu, Ōtorohanga, Putaruru, Tokoroa, Cambridge, Hamilton, or surrounding areas, your local Vetora clinic is here to support your calf rearing success. Contact us for tailored advice, drenching plans, and growth monitoring tools.