Comprehensive Feedstuffs and Additives in Livestock Nutrition Practice Test 2026 - Free Livestock Nutrition Practice Questions and Study Guide

Antioxidants in feed primarily protect fats and other unsaturated components from oxidation. Unsaturated fats are prone to lipid peroxidation when exposed to air, light, or heat, which leads to rancidity, off-flavors, and loss of nutritional value. Antioxidants donate electrons or hydrogen atoms to lipid free radicals, interrupting the radical chain reactions and stabilizing the fats. This action preserves the quality, palatability, and nutritional value of the feed, especially for feeds rich in unsaturated fats.

They don’t neutralize rumen bacteria or act as antimicrobials, so they aren’t chosen for altering rumen microbial balance. They don’t increase crude fiber, since fiber content is determined by plant cell-wall structure, not by antioxidant addition. They also don’t supply minerals, since minerals are inorganic nutrients; antioxidants are typically organic compounds like vitamin E or similar additives that protect lipids from oxidation.