Optiprill Rumen Plus SI

Optiprill Rumen Plus South Island

Optiprill Rumen Plus SI is a targeted mineral supplement formulated for early lactation in the South Island. Designed to support rumen function and mineral balance, this prill delivers essential nutrients to cows on pasture-based diets during the most demanding production phase. Perfect for in-shed or trough feeding, Optiprill Rumen Plus SI is easy to use in the shed or the paddock, and on the feedpad.

Scientifically-proven features and benefits:

High in rumen-available magnesium, calcium, phosphorus, and sulphur to support metabolic health.
Contains essential trace elements: cobalt, chromium, zinc, selenium.
Promotes strong rumen function and microbial activity.
Supports liver health and immune resilience.
Aids calcium mobilisation to reduce milk fever risk.
Helps maintain production in variable pasture conditions.
Dust-free prill format for easy feeding and minimal waste.
Tailored to suit typical South Island pasture mineral profiles.

Your Agvance Consultant can advise on how best to incorporate Optiprill Rumen Plus into your early lactation programme to support cow health and maintain performance.

Talk to your local Agvance Consultant

Practical mineral support during early lactation

Early lactation puts a huge strain on a cow’s mineral reserves. If key elements like magnesium, calcium, and phosphorus are lacking, cows are more likely to suffer from metabolic issues and production setbacks. Optiprill Rumen Plus SI delivers the right balance of macro and trace minerals to meet these rising demands.

Better rumen function, better results

Healthy rumen microbes drive the cow’s digestion, energy production, and milk output. Optiprill Rumen Plus SI supports microbial function with targeted trace elements and macro minerals that stabilise rumen pH and boost feed conversion.

Simple to feed, easy to absorb

Formulated for flexibility, this prill offers fast uptake without disrupting your system. There’s no need for extra handling and no dust – just reliable mineral delivery to keep cows performing.

Ready to support early lactation?

Call 0800 BALANCE, contact your local Agvance Consultant, or log in to your account to order online. Optiprill Rumen Plus SI is a smart and practical way to support your herd through early lactation and beyond.

What the research shows

A study in lactating dairy cows found that a magnesium-based supplement helped maintain higher rumen pH during a concentrate challenge, with less drop in dry matter intake than sodium bicarbonate and better maintenance of milk production as the barley challenge increased. (DOI: 10.3168/jds.2017-14353)
A controlled study found that magnesium oxide supplementation increased ruminal pH across the post-feeding period, increased milk fat percentage, and that smaller, more reactive magnesium oxide particles were more available to cattle than less reactive sources. (DOI: 10.3168/jds.S0022-0302(89)79128-1)
A meta-analysis of dairy cattle studies found that magnesium source and solubility affected magnesium availability, with true magnesium absorption averaging about 20% of intake and declining as dietary potassium increased. (DOI: 10.3168/jds.2023-23560)

Limits

These studies test magnesium supplementation, rumen pH support, and magnesium availability from different sources, not this specific Agvance product. They also do not directly test the product’s exact formulation in typical South Island pasture-based dairy systems.

Study details and links

What was tested

Research on magnesium supplementation and rumen support in lactating dairy cows, including magnesium-based supplements under concentrate challenge, magnesium oxide sources with different reactivity and particle size, and broader evidence on magnesium absorption from

What was measured

Rumen pH, dry matter intake, milk production, milk fat, rumen fermentation measures, magnesium availability, and factors affecting magnesium absorption such as source quality and dietary potassium.

Study links (DOI / publisher)

Modulation of rumen pH by sodium bicarbonate and a blend of different sources of magnesium oxide in lactating dairy cows submitted to a concentrate challenge, Journal of Dairy Science: DOI 10.3168/jds.2017-14353
PubMed record: https://pubmed.ncbi.nlm.nih.gov/30172393/
Effect of reactivity rate and particle size of magnesium oxide on magnesium availability, acid-base balance, mineral metabolism, and milking performance of dairy cows, Journal of Dairy Science: DOI 10.3168/jds.S0022-0302(89)79128-1
PubMed record: https://pubmed.ncbi.nlm.nih.gov/2703568/
Magnesium in dairy cattle nutrition: A meta-analysis on magnesium absorption in dairy cattle and assessment of simple solubility tests to predict magnesium availability from supplemental sources, Journal of Dairy Science: DOI 10.3168/jds.2023-23560
Publisher page: https://www.sciencedirect.com/science/article/pii/S0022030223006069

More detail on limits

Evidence supports magnesium-based rumen support and magnesium supplementation strategies, not this branded product on its own.
Results depend on magnesium source, solubility, particle size, diet composition, potassium level, and feeding system.