0
Reducing Stress at Weaning: Practical Tips for a Smooth Transition
Weaning marks a major milestone in a calf’s early life. It’s a time of rapid dietary change, shifting routines, and new environmental pressures. Managed well, this transition supports healthy rumen development and consistent growth. Managed poorly, it can lead to setbacks such as digestive upsets, respiratory issues, or a prolonged growth check.
Understanding how calves adapt and what they need during this period can make all the difference.
Why Weaning Matters
The process of weaning moves a calf from a milk-based diet to solid feeds like grass and concentrates. Calves can be weaned either abruptly or gradually, but only when their rumen is sufficiently developed. As a rule of thumb, calves should be eating a minimum of 1.5kg of concentrates daily before milk is withdrawn.
While abrupt weaning is possible, most farmers find that a gradual approach results in less stress and fewer health issues. It allows the calf’s digestive system to adapt slowly, reducing the risk of pneumonia, digestive upset, or growth stunting.
A Step-by-Step Approach to Gradual Weaning
A controlled, predictable routine is the foundation of stress-free weaning. Here’s how to ease calves through the process:
- Reduce milk gradually over 7–10 days
Begin by cutting back feeding frequency. If calves are being fed twice daily, reducing to once a day signals the start of the transition without overwhelming them.
- Support calves on higher milk volumes
Those consuming 6 litres or more per day will need additional concentrate intake to maintain energy levels as milk reduces.
- Keep concentrate type consistent
Switching concentrate types during weaning can unsettle the digestive system. Continue feeding the same concentrate before, during, and after weaning.
- Avoid overlap with other stressful events
Procedures like disbudding or mixing age groups should not coincide with weaning. Adding extra stress at this stage can compromise growth and immunity.
- Don’t limit-feed concentrates too early
Offering concentrates twice daily is appropriate from two weeks post-weaning, but introducing restriction earlier can hinder growth.
The Challenges of Turnout
Turnout to grass is another significant adjustment. Calves must cope with a series of rapid changes—new surroundings, variable weather, larger group sizes, and different forage quality. On top of that, concentrate feeding often drops, which adds another layer of stress.
Even after weaning, calves do not yet have fully mature rumens. Their rumen remains smaller and less efficient than that of older animals, meaning they can struggle to process large amounts of fibrous forage. This is why small dietary changes at this stage can have outsized effects on performance, especially for future replacement heifers.
Fibre Matters
When calves first encounter fresh grass, their fibre intake often dips. This can reduce cud chewing and unsettle the rumen. A sudden move to leafy spring grass may even contribute to signs of wasting in some dairy calves as their digestive system adjusts.
Supporting the rumen through this period is crucial to maintaining performance through turnout and into the grazing season.
Feeding for Success at Turnout
Introducing GAIN RumenCare Calf Nut ahead of turnout can greatly smooth this transition. By familiarising calves with the product beforehand, you improve the likelihood that they will continue eating it once they hit grass—supporting both energy intake and rumen stability.
Recommended Feeding Rate
Feed 1kg–1.5kg per 100kg bodyweight per day, adjusting for:
- Grass availability
- Weather conditions
- Calf condition and appetite
This helps bridge the nutritional gap between milk feeding and full grazing, ensuring calves maintain growth momentum.
For guidance tailored to your farm or to learn more about GAIN Rumencare Calf Nut, contact your local Tirlán FarmLife representative.
First Published: 21 April 2026