Use the digital refractometer to quickly evaluate colostrum quality using Brix measurements and help ensure calves receive the antibodies needed for strong immunity and successful passive transfer. Serum total protein testing also provides a valuable tool for monitoring calf health programs and evaluating colostrum management success across dairy operations.

The advanced COL STP MS HYD model expands functionality even further by measuring milk solids percentage and hydration, helping producers monitor calf nutrition consistency and support calf recovery efforts during stress or illness.

Both models are simple to operate, easy to clean, and compact enough to carry anywhere on the farm. Each unit includes a durable rubber protective jacket and a storage case for added protection and convenience.

• Test colostrum quality before feeding newborn dairy or beef calves
• Monitor passive transfer with serum total protein testing
• Measure milk solids concentration in calf feeding programs

This stage, often called the “immunity gap,” can increase the risk of digestive challenges, scours, reduced feed intake, and slower growth.

First 21 is specifically designed to help bridge this critical immunity gap during the first three weeks of life. As a nutritional supplement, First 21 provides research-supported ingredients that help support calf immunity, digestive health, and growth performance during this important stage of development.

First 21 Supplement can be added to pasteurized whole milk or calf milk replacer. Ideal for producers who:

• Feed pasteurized whole milk
• Use an existing milk replacer program
• Want additional immune and digestive support during the first weeks of life

First Day Formula® CR (Colostrum Replacer) is a complete replacement for maternal colostrum. Delivers 150g of bovine immunoglobulins per feeding. Ideal when colostrum is unavailable or low quality.

First Day Formula® CR Deluxe (with First Defense) has all the benefits of CR, plus added pathogen-specific antibodies. Provides targeted support against common calfhood challenges (like scours).

First Day Formula® CS (Colostrum Supplement) is designed to boost maternal colostrum quality. Helps ensure adequate passive transfer when colostrum tests marginally.

The first feeding is one of the most critical moments in a calf’s life. First Day Formula® CR (Colostrum Replacer) and CS (Colostrum Supplement) are designed to ensure calves receive the immune support they need without the uncertainty that often comes with maternal colostrum.

Formulated with 100% natural dried bovine colostrum, First Day Formula delivers a consistent dose of 150 grams of globulin protein per feeding, meeting current research-based recommendations for colostrum replacers. This helps calves achieve successful passive transfer, a key driver of health, growth, and long-term productivity.

In a large-scale study, 299 out of 300 calves fed First Day Formula CR achieved successful passive transfer, statistically equivalent to calves fed high-quality maternal colostrum. That level of consistency makes it one of the most trusted and researched colostrum solutions available.

Beyond immune protection, First Day Formula helps eliminate the risk of transmitting diseases that can be present in maternal colostrum. It also offers unmatched convenience, whether you’re managing nighttime calvings, short-staffed periods, or inconsistent colostrum supply.

For producers focused on calf health, efficiency, and predictable outcomes, First Day Formula provides both quality assurance and quantity assurance, ensuring every calf gets what it needs, every time.

When to Use

• Maternal colostrum is unavailable or insufficient
• Colostrum quality is low (below 20 Brix)
• To supplement moderate-quality colostrum (20–24 Brix)
• When calves won’t consume recommended colostrum volumes
• To reduce disease transmission risk from cow to calf
• During busy seasons, labor shortages, or nighttime feedings