From milk to minerals, back to cows

What if the minerals cows need most could come from the milk they produce? Country Mile M5 Forage Boost Mix shows how closing the loop can simplify nutrition in forage-based systems.

Modern dairy systems are increasingly built on high energy forages – from maize and whole crop silage to winter brassicas. These systems can perform exceptionally well, but they share a common challenge: forage alone doesn’t always deliver the full mineral picture cow's need.

In particular, many forage diets are naturally low in four key minerals – phosphorus, magnesium, calcium and sodium. When intake is inconsistent or demand is high, shortfalls can increase metabolic risk, limit feed utilisation, and quietly impact production, fertility and animal health.
 

Why phosphorus often limits forage systems

Phosphorus plays a central role in energy metabolism, bone strength, milk production and reproductive performance. Yet crops widely used across New Zealand – including maize silage, fodder beet, kale, swedes and other brassicas – are typically low in phosphorus. 

Without effective supplementation, low P diets can reduce feed efficiency and place unnecessary pressure on cows during already demanding periods such as winter grazing, autumn transition and late pregnancy.
 

Test first, supplement with intent

One of the biggest risks in mineral nutrition is guessing. Forage testing helps identify what minerals are being offered in the diet, while cow testing, guided by a vet or advisor, can confirm what cows are actually absorbing and where reserves may be low. 

Used together, testing removes uncertainty and helps farmers target what’s needed, avoid over-supplying what isn’t, and make mineral investment count – particularly during high-risk forage feeding periods. 
 

Turning a byproduct into a nutrition solution 

This is where Country Mile M5 Forage Boost Mix takes a different approach.

Instead of relying on imported, mined Di Calcium Phosphate (DCP), M5 uses natural Milk Minerals as its primary phosphorus source – a dairy byproduct from Fonterra milk processing that returns milk derived minerals back to the cow.

It’s a simple idea with meaningful benefits. Milk Minerals provide phosphorus in a form that’s well suited to ruminant diets, more palatable, and locally sourced, reducing exposure to the cost volatility and supply uncertainty often associated with imported phosphates.
 

Closing the loop – practically 

Milk Minerals are a tangible example of circular nutrition. Rather than exporting value out of the system, nutrients already present in milk processing are repurposed and returned to dairy cows.

For farmers, this means making better use of onshore resources and choosing solutions that stack up both nutritionally and economically.
 

One mix, fewer decisions 

Mineral management often becomes more complex during high-risk forage feeding periods. M5 Forage Boost Mix is designed to simplify that complexity, with phosphorus already included alongside magnesium, calcium and sodium in one pre-balanced daily supplement.

That means: 

• Reduces the need for additional Di Calcium Phosphate (DCP) product as a supplement 
• One easy pre-mix suited to variable intake periods 
• A practical way to support cows through winter, transition whether feeding on maize silage and/or forage crops.

Not only does M5 have higher mag levels in its formulation, it also makes for a very efficient delivery system for such a critical mineral supplement.

It’s a formulation built for the realities of busy farms, variable weather, and changing forage quality.

Talk with your Farm Source team about how mineral gaps may be affecting your system, look out for Country Mile M5 Forage Boost Mix in store, and consider it as part of your winter forage or silage mineral strategy.

Country Mile products are available exclusively at Farm Source Stores.