Study: Presence of peroxides, aldehydes predict oils' performance in feed

But pigs are more sensitive than poultry to the growth-slowing effects of lipid oxidation, USDA researcher says.

August 18, 2026

Three glass bottles of golden cooking oil arranged against a bright yellow background with reflective surfaces

JanPietruszka | BigStock.com

Fried foods probably aren't the best for humans — and high levels of oxidized used cooking oil may reduce pigs' and chickens' feed intake, according to a decade of studies recently summarized by the U.S. Department of Agriculture's (USDA) National Laboratory for Agriculture and the Environment.

The research — which spans several feeding trials in pigs and poultry — identified peroxides and aldehydes as the compounds that best predict whether overheated or rancid oil will affect feed intake, and ultimately animal performance.

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