Less in, more out: The rise of precision gut nutrition
Regulators are removing the additives that have traditionally supported gut health in young pigs and broilers. The replacements keep failing for one reason – and the fix is about delivery, not dose.
Across Europe, and increasingly worldwide, the feed sector is moving beyond the tools that stabilised the young pig and poultry gut. Pharmacological zinc oxide has been phased out across the EU. Medically important antibiotics are restricted in feed and under voluntary reduction elsewhere. High inclusion rates of copper face tightening limits, on both efficacy and the load they leave in manure.
Each was a workhorse through weaning and early growth – and losing them, without functional replacements, means slower gain, more enteric disease and higher cost.
Why most additives fail before they work
The harder question is not what to eliminate, but what can stand in. Here, many alternatives quietly underperform – not because the active is wrong, but because it never arrives where it works.
An additive must be able to survive steam pelleting, pass intact through the acidic stomach, and go to work in the jejunum and ileum, where most absorption and microbial modulation occur. Many minerals and organic acids dissolve in the stomach or duodenum and are spent long before the lower gut. Others are degraded by pelleting heat and shear. A few create fresh problems: raw copper sulfate can erode the gizzard, and unprotected acids irritate the upper tract.
Delivery, not dose
This is why attention is moving from how much of an active is added to where and when it is released. Microencapsulation – the principle behind Maxx Performance’s delivery platform – coats each active particle in a thin, food-grade matrix that withstands feed processing and protects the active through the stomach before releasing it gradually across the small intestine, converting a blunt, high-dose input into a targeted one.
The same coating approach applies across active classes, from minerals and organic acids to essential oils and live probiotics, wherever survival through the feed mill and the stomach is the bottleneck. The principle is simple: protect the molecule until it reaches the tissue that needs it.
What the research shows
The performance case is now backed by controlled trials. In a 28-day nursery study at Virginia Tech, 256 weaned pigs received microencapsulated zinc oxide at inclusion levels roughly 95% lower than pharmacological levels. Despite the dramatic reduction, the treatment matched – and ultimately outperformed – a control diet formulated to meet NRC zinc requirements.
Average daily gain improved by about 21%, feed efficiency by about 16%, and jejunal villus height – a key marker of absorptive capacity – rose significantly. But the most important number may be the reduction itself: approximately 95% less zinc input than pharmacological zinc oxide, with no loss in performance and far less zinc excreted into manure.
Figure 1 – Body weight over the 28-day Virginia Tech nursery trial; microencapsulated zinc oxide vs an NRC recommended-zinc control, on around 95% less zinc than pharmacological dosing
The same logic holds across minerals and species. In an independent broiler trial conducted under coccidiosis challenge and without antibiotics – conditions designed to mirror commercial production and presented at the 2025 Poultry Science Association meeting – microencapsulated copper sulfate produced significantly greater weight gain than control birds while using less copper than a conventional raw-sulfate diet.
Just as importantly, it achieved those gains with no gizzard erosion and an intact intestinal barrier: the very side effects that typically limit how aggressively copper can be used in poultry nutrition.
Doing more with less
Taken together, the trials point in the same direction: targeted delivery allows producers to meet tightening zinc, copper and antibiotics without giving up the performance those tools were originally designed to protect. Fewer minerals and antibiotics in the diet means lower excretion, reduced environmental pressure, and more regulatory flexibility. Maintained gain and feed conversion mean the margin per head still holds.
The post-antibiotic era does not have to become a post-performance one – provided the active reaches the right place, at the right time, and in the right amount.
