How to Adjust Mineral Supplementation for Cattle by Season and Age

Mineral supplementation isn’t a "set it and forget it" task. Just like pasture quality, weather patterns, and herd needs change throughout the year, so too should your mineral program.

Not only that — calves, growing heifers, mature cows, and bulls all have different mineral requirements at different stages of life.

Having a seasonal and age-based mineral supplementation schedule helps keep your cattle healthy, productive, and ready for whatever the year brings. Here's how to build a smart, flexible plan.

Seasonal Mineral Supplementation Schedule

Spring (March–May)

Challenges:

• Rapid grass growth can lead to lush, low-magnesium forage.
  
  

• Breeding season preparations begin (or are underway).
  
  

• Increased moisture can leach key minerals from soil.
  
  

Focus Minerals:

• Magnesium (prevent grass tetany)
  
  

• Calcium & Phosphorus (for reproduction and skeletal health)
  
  

• Copper & Selenium (for strong immunity and fertility)
  
  

Strategy:

• Offer a high-magnesium mineral starting 2–3 weeks before turnout onto lush pastures.
  
  

• Maintain access to a balanced breeding mineral mix rich in copper, selenium, and phosphorus.

Summer (June–August)

Challenges:

• Heat stress reduces feed intake and water intake.
  
  

• Pasture quality can decline.
  
  

• Fly pressure and disease risk increase.
  
  

Focus Minerals:

• Salt (encourage water consumption)
  
  

• Potassium (support hydration and energy)
  
  

• Zinc (promote hoof health and immune function)
  
  

Strategy:

• Place minerals near shade or water to maintain intake.
  
  

• Supplement with a high-salt, high-potassium mineral in extreme heat.
  
  

• Ensure zinc and copper levels stay adequate to manage skin and hoof health.

Fall (September–November)

Challenges:

• Transition to stockpiled forage or crop residue.
  
  

• Cows preparing for winter and gestation demands.
  
  

• Mineral deficiencies from dried or lower-quality forages.
  
  

Focus Minerals:

• Phosphorus (support fetal development)
  
  

• Vitamin A (boost immunity heading into winter)
  
  

• Copper & Zinc (sustain reproductive health and immune response)
  
  

Strategy:

• Switch to a high-phosphorus mineral for cows grazing on dry grasses or cornstalks.
  
  

• Consider Vitamin A injections or high-Vitamin A minerals, especially if pasture is brown or dormant.
  
  

Winter (December–February)

Challenges:

• Cold stress increases energy and mineral demands.
  
  

• Hay quality often lower than fresh forage.
  
  

• Calving season preparations (or calving underway).
  
  

Focus Minerals:

• Calcium & Phosphorus (support late gestation and calving)
  
  

• Magnesium (assist with muscle contractions during calving)
  
  

• Vitamin E & Selenium (prevent white muscle disease in newborn calves)
  
  

Strategy:

• Provide balanced late-gestation minerals 60 days before calving.
  
  

• Supplement additional selenium and Vitamin E if local soils are deficient.
  
  

• Ensure minerals are protected from weather — wet minerals lose palatability fast!
  
  

Mineral Needs by Cow Age & Stage

Adjusting Your Program

• Monitor intake: Mineral consumption should match product recommendations (e.g., 2–4 oz per head per day).
  
  

• Watch weather patterns: Wet years and droughts both change pasture mineral profiles.
  
  

• Test forage and hay: Knowing your feed’s mineral content saves money and prevents over- or under-supplementation.
  
  

• Consult a nutritionist: For large herds or high-value animals, fine-tuning a custom mineral program pays off.

Final Thoughts

A year-round mineral supplementation plan that accounts for both seasons and cow age/stage ensures your cattle are always getting what they need — no more, no less.
Healthy, well-mineralized cows mean:

• Better fertility rates
  
  

• Stronger calves
  
  

• Improved weight gains
  
  

• Lower vet bills
  
  

Start planning mineral shifts before the seasons change and adjust based on real-world observations. Your herd — and your wallet — will thank you.