Description

Give to cows once at calving – NEW CowStart formulation

New for Spring 2026 – CowStart Complete is administered once at calving. No need to repeat dosing 12-15 hours later compared to the previous CowStart Bolus. This saves you time, reduces stress on you and the cow, and provides all the proven CowStart benefits:

• Improved calcium status
• Improved metabolic and energy status
• Improved immune function
• Increased milk and fertility performance

How many CowStart Complete boluses do I need?

Each 12-cow pack contains 24 individually wrapped boluses.

All research findings with CowStart have been completed with cows receiving two boluses.

In a busy seasonal calving period, many farmers follow this typical 100-cow example of how to use CowStart Complete:

• If 60 cows are 3rd lactation and greater – 2 boluses each = 5x 12-cow packs/boxes required
• Remaining 40 1st & 2nd lactation cows to receive a single bolus at calving = 2 boxes required (8 boluses left spare)
• So, for a 100-cow herd calving in Spring 2026, 7 boxes of CowStart Complete required
• Or, if you follow the 2-bolus proven protocol – 9 boxes required (spare boluses left for next calving season)

Scientifically Proven Benefits

Extensive research trials in Irish seasonal calving farms and UK year-round calving systems since 2018 have demonstrated the efficacy of CowStart Complete Calcium Boluses in maintaining elevated calcium levels in dairy cows, leading to:

• Reduced Incidence of Milk Fever: By providing readily available calcium, these boluses help prevent hypocalcaemia and subclinical hypocalcaemia (milk fever), which can adversely affect milk production and overall cow health. Read more about milk fever prevention here.
• Improved Post-Calving Recovery: Adequate calcium supplementation supports muscle function and metabolic processes, facilitating a smoother recovery after calving.
• Enhanced Milk Production: 1.3kg extra milk per day compared to control cows. Maintaining optimal calcium levels is crucial for maximizing milk yield, directly impacting farm profitability.
• Improved Fertility Performance: proven to reduce days to 1st service and reduce the number of serves per conception.

Unique Bio-Availability with Maerl Seaweed

CowStart Calcium Boluses stand out as the only calcium bolus on the market formulated with Maerl seaweed, a natural and highly bioavailable source of calcium. Unlike synthetic calcium sources, Maerl seaweed offers superior absorption and retention, ensuring that cows receive the maximum benefit from supplementation. This exclusive formulation makes CowStart Calcium Boluses the most effective option available, outperforming all competitor products.

Expert Endorsement

Cathal, our lead veterinarian at ReproVet Ireland, was an integral member of the research team conducting reproductive examinations on trial cows. His firsthand experience with the product’s effectiveness reinforces our confidence in recommending CowStart Complete Calcium Boluses to our clients.

Product Features

• Rapid Absorption: Formulated for quick release, ensuring timely calcium availability when your cows need it most.
• Long -Lasting: a single dose of two boluses at calving elevates blood calcium for 48 hours post calving. 
• Easy Administration: Designed for straightforward oral administration, minimising stress for both the animal and the handler.
• High-Quality Ingredients: Manufactured using premium components to ensure safety and efficacy, including the uniquely bioavailable Maerl seaweed calcium, providing 106g of Calcium per dose.
• More than Calcium – CowStart also contains 7g of Magnesium to help Calcium absorption; 80000IU VitD3 to support skeletal & gut calcium metabolism; rumen-protected selenium and Vitamin E to support the cow’s immune recovery;

Why Choose CowStart Complete Calcium Boluses?

CowStart Complete is more efficient and more effective than using injectable calcium bottles for prevention of hypocalcaemia.

CowStart is proven to be more effective than competitor bolus products. No other calcium bolus for cows contains Maerl seaweed.

Investing in CowStart Complete means prioritising the health and productivity of your dairy herd. With proven results, research-backed benefits, and the endorsement of veterinary professionals like Cathal, you can trust this product to support your cows during the demanding transition period.

Order now from the ReproVet Online Shop and provide your herd with the scientifically backed, superior-quality calcium, immune and metabolic support they deserve.