When Should Post-Calving Calcium Support Be Given?

Correct timing of calcium supplementation is critically important in preventing milk fever. In this guide, we explain optimal timing and application protocols.

Why Is Timing Important?#

Calcium requirements increase dramatically during and after calving:

Before Calving#

• Normal calcium requirement: ~30-40 g/day
• The body is in balance

At Calving#

• Intensive calcium use for contractions
• Blood calcium begins to drop

After Calving#

• Colostrum production: ~2 g calcium/liter
• Milk production: ~1.2 g calcium/liter
• Daily calcium requirement: ~80-100 g/day

The body cannot immediately adapt to this sudden increase, creating a risk of hypocalcemia.

Optimal Timing#

Standard Protocol#

+---------------------------------------------------------+
|  Timing                     |  Application              |
+---------------------------------------------------------+
|  Signs of calving           |  1st Bolus                |
|  (or 12 hours before        |                           |
|  calving)                   |                           |
+---------------------------------------------------------+
|  Immediately after calving  |  2nd Bolus                |
|  or 12 hours later          |                           |
+---------------------------------------------------------+

Extended Protocol for High-Risk Cows#

+---------------------------------------------------------+
|  Timing                     |  Application              |
+---------------------------------------------------------+
|  Signs of calving           |  1st Bolus                |
+---------------------------------------------------------+
|  Immediately after calving  |  2nd Bolus                |
+---------------------------------------------------------+
|  12 hours after calving     |  3rd Bolus                |
+---------------------------------------------------------+
|  24 hours after calving     |  4th Bolus (optional)     |
+---------------------------------------------------------+

Protocols by Risk Group#

Low-Risk Cows#

Definition: 1st-2nd calving, normal body condition, no history of milk fever

Protocol:

• A single bolus after calving may be sufficient
• Additional bolus if signs are observed

Medium-Risk Cows#

Definition: 3rd-4th calving, normal body condition

Protocol:

• Before or at calving: 1 bolus
• 12 hours after calving: 1 bolus

High-Risk Cows#

Definition: 5+ calvings, overconditioned, history of milk fever, Jersey breed

Protocol:

• Before calving: 1 bolus
• At calving: 1 bolus
• 12 hours later: 1 bolus
• 24 hours later: 1 bolus
• Continue as needed

Practical Application Tips#

Recognizing Signs of Calving#

• Udder swelling and tightening
• Relaxation and swelling of the vulva
• Relaxation of pelvic ligaments
• Restlessness, pawing the ground
• Mucus discharge

For Nighttime Calvings#

• Evening check: If signs of imminent calving are present, give a bolus
• Morning check: If calving has occurred, give the second bolus immediately

Group Calving Management#

• List expected calving dates
• Mark high-risk cows
• Keep bolus stock ready

Common Mistakes#

1. Administering Too Late#

Do not wait until milk fever symptoms appear

Instead, apply prophylactic (preventive) treatment

2. Insufficient Dose#

Do not give only 1 bolus and stop

Instead, administer repeat doses according to the protocol

3. Wrong Timing#

Do not give boluses days after calving

Instead, give before and immediately after calving

4. Not Performing Risk Assessment#

Do not apply the same protocol to all cows

Instead, determine the protocol based on risk group

Calcium Bolus Selection#

VK Pro Calcium Advantages#

• Highly bioavailable calcium sources
• Fast and slow release combination
• Vitamin D content (absorption support)
• Magnesium content (synergistic effect)
• 54 g elemental calcium/bolus

Monitoring and Evaluation#

Post-Application Monitoring#

• Close observation for the first 24 hours
• Monitor feed and water intake
• Standing and mobility
• Milk yield monitoring

Success Indicators#

• No signs of hypocalcemia
• Normal feed consumption
• Normal onset of milk production
• Complication-free period

Record Keeping#

Record for each cow:

• Date and time of calving
• Number and timing of boluses administered
• Signs observed (if any)
• Additional treatment requirements

These records will serve as a reference for future calvings.

Conclusion#

With proper timing, calcium support significantly reduces the risk of milk fever. Perform a risk assessment, apply according to protocol, and monitor the results.

Always follow your veterinarian's recommendations.