Several procedures increase feed efficiency in livestock, but pelleting feed is one of the most widely applied and consistently effective. Converting mash feed into pellets improves how well animals convert feed into weight gain or product, and it works across species. That said, no single procedure works in isolation. The biggest gains come from combining physical feed processing, genetic selection, feed additives, precision feeding, and environmental management.
How Pelleting Improves Feed Conversion
Pelleting compresses loose feed ingredients into dense, uniform pellets using heat, moisture, and pressure. This process gelatinizes starches, reduces feed waste, and makes it harder for animals to sort through and reject ingredients. The result is a lower feed conversion ratio (FCR), meaning the animal needs less feed per unit of weight gained or product produced.
In laying hens, pelleted diets improved laying rate, egg weight, and shell strength compared to mash diets, while also reducing FCR in certain breeds. In finishing pigs, pellet diets improved feed efficiency across a 12-week trial period. The improvement is partly mechanical: pellets reduce the amount of feed that gets scattered, blown away, or left uneaten in the feeder.
Particle Size: A Simple Adjustment With Real Impact
Grinding grain to a finer particle size before feeding increases the surface area available for digestive enzymes to work on. In finishing pigs, reducing corn particle size from 900 microns down to 600 microns significantly improved feed efficiency in both pelleted and mash diets. The sweet spot appears to be at or below 750 microns for swine.
There’s a practical limit, though. Grinding too fine increases the risk of stomach ulcers in pigs and raises milling energy costs. The goal is to find the particle size that maximizes digestibility without causing gut health problems.
Steam Flaking Grain for Cattle
For beef cattle on finishing diets, steam flaking corn is one of the most effective processing methods available. Compared to dry-rolled corn, steam-flaked corn increases total tract starch digestion by about 10% and boosts the usable energy value of corn by 11 to 16%. That translates directly into cattle gaining more weight from the same amount of grain.
Steam flaking works by exposing grain to steam before passing it through rollers, which ruptures the starch granules and makes them far more accessible to rumen microbes. It requires specialized equipment and adds processing cost, but the efficiency gains in large feedlot operations typically justify the investment.
Ionophores Shift Rumen Fermentation
In ruminants like beef and dairy cattle, ionophore feed additives reshape the microbial population in the rumen. They selectively suppress certain bacteria that produce less useful fermentation byproducts (like acetate and methane) while allowing bacteria that produce propionate to thrive. Propionate is a more energy-efficient fuel for the animal because it can be converted directly into glucose.
The net effect is that the animal extracts more usable energy from the same volume of feed, and less energy is lost as methane gas. Ionophores have been one of the most widely used feed efficiency tools in the cattle industry for decades, effective on both forage-based and grain-based diets.
Enzyme Additives Unlock Trapped Nutrients
Much of the phosphorus in cereal grains is locked inside a compound called phytate, which poultry and swine can’t break down on their own. Adding phytase to feed releases that bound phosphorus, making it available for absorption and reducing how much supplemental phosphorus needs to be added to the diet. This also cuts phosphorus levels in manure, which matters for environmental compliance.
A second commonly used enzyme, xylanase, breaks down the tough fiber structures in cell walls of grains like wheat and barley. These fibers can form a viscous gel in the gut that traps nutrients and slows digestion. Xylanase breaks that gel apart, freeing nutrients for absorption and promoting healthier gut bacteria. Together, these enzymes let animals get more nutrition from cheaper, plant-based feed ingredients.
Genetic Selection for Efficient Animals
Breeding programs focused on feed efficiency have produced measurable results across all major livestock species. The key metric is residual feed intake (RFI), which measures how much an animal eats compared to what it’s predicted to eat based on its size and growth rate. Animals with low RFI eat less than expected while still growing at the same pace, making them genuinely more efficient.
Research on dairy calves found that low-RFI animals were 13% more efficient than high-RFI animals. The efficient calves produced 15.3% less body heat, had lower heart rates, and consumed less oxygen. These animals simply spend less energy on basic bodily maintenance, leaving more energy available for growth or milk production. In pigs, decades of selection for meat production have shifted muscle fiber types toward varieties that use less energy, improving metabolic efficiency at the cellular level.
The gains from genetic selection are permanent and compound over generations, making this one of the most powerful long-term strategies even though it doesn’t produce immediate results.
Precision Feeding Reduces Waste
Precision feeding uses electronic feeders to deliver individually calibrated portions to each animal multiple times per day, rather than dumping a fixed amount into a trough twice daily. In a trial with lactating sows, those fed with electronic feeders six times daily consumed 23 kilograms less total feed over the lactation period compared to sows fed conventionally twice daily. That’s a reduction from about 184 kg to 161 kg, with no difference in body weight, back fat, or metabolic health at weaning.
The savings came primarily from reduced feed waste rather than reduced actual intake. The sows fed precisely had similar or even better metabolic markers, including higher blood glucose levels. Precision feeding also produced the same number and weight of weaned piglets per sow, meaning the feed savings came without any productivity cost.
Environmental Control Protects Efficiency
Even perfectly formulated and processed feed loses its efficiency advantage if animals are burning extra energy staying warm or cool. Ruminants perform best in air temperatures between 13 and 20°C (roughly 55 to 68°F), with moderate humidity between 55 and 65%. Within this comfort zone, animals achieve maximum productivity at the lowest biological cost.
When temperatures climb above this range, animals reduce their feed intake and divert energy toward cooling themselves. When temperatures drop below it, metabolism ramps up to generate body heat. Either direction pulls energy away from growth or production. Proper barn ventilation, cooling systems, insulation, and shade structures don’t change feed composition at all, but they protect the efficiency gains from every other procedure on this list.
How These Procedures Stack Up
Modern commercial broilers illustrate what happens when multiple efficiency procedures are applied together over time. Updated nutritional programs combined with genetic progress have driven broiler FCR down to roughly 1.54 kg of feed per kg of gain, a 26% improvement compared to genetics from 1983. That improvement reflects decades of compounding gains from better genetics, pelleted feeds, enzyme supplementation, and environmental management working simultaneously.
- Pelleting and particle size reduction offer the most immediate, accessible improvements and work across species.
- Steam flaking provides the largest single-procedure gain for grain-fed cattle, boosting corn’s energy value by 11 to 16%.
- Ionophores and enzymes improve nutrient extraction from existing feed without changing the physical diet.
- Genetic selection delivers the largest cumulative gains over time but requires years of breeding investment.
- Precision feeding and climate control prevent waste and protect the efficiency gains from all other methods.
No single procedure is the universal answer. The best approach depends on your species, scale, and existing operation. But if you’re looking for one change with the broadest applicability and fastest payoff, pelleting your feed is the most reliable starting point.