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Summary: This study investigated the effects of soybean oil nanoemulsion compared with conventional soybean oil under different dietary energy levels on the performance, metabolism, nutrient utilization, and meat quality of broiler chickens. A total of 360 male Ross 308 broilers were allocated to a 3 × 2 factorial arrangement, comprising two oil sources (soybean oil nanoemulsion vs. conventional soybean oil) and three dietary energy levels (recommended, −50, and −100 kcal/kg), in a completely randomized design with six treatments, four replicates, and 15 birds per replicate. Across 42 days, growth performance (weight gain, feed intake, feed conversion ratio, and mortality) did not differ among treatments. Carcass yield was unaffected, although breast yield increased at −100 kcal/kg, abdominal fat was elevated at −50 kcal/kg, and digestive tract proportion decreased at −100 kcal/kg (P<0.05). Lipid metabolism showed distinct oil × energy interactions: low-density lipoprotein spiked with nanoemulsion at −50 kcal/kg, triglycerides increased with nanoemulsion at −100 kcal/kg, while soybean oil maintained lower levels. Energy reduction increased high-density lipoprotein but reduced alkaline phosphatase activity (P<0.05). Intestinal morphology revealed elongated villi at −100 kcal/kg without changes in crypts. Nutrient digestibility and metabolizable energy were enhanced by nanoemulsion only at standard energy; these benefits were lost under restriction (P<0.05). Regarding meat quality, nanoemulsion improved oxidative stability under reduced energy, lowering malondialdehyde values (P<0.05), while energy reduction increased pH but did not alter water‑holding capacity or proximate composition. Soybean oil nanoemulsion can enhance nutrient utilization and meat oxidative stability in broilers, but its advantages are strongly dependent on adequate dietary energy supply.
Moradi et al. (2026) studied this question.