Effect of Dietary Energy Source and Level on the Performance, Antibody Titers and the Relative Expression of IL-2 and IL-6 Genes in Broilers under Heat Stress | ||
| Journal of Agricultural Science and Technology | ||
| Article 10, Volume 27, Issue 6, November and December 2025, Pages 1371-1382 PDF (2.72 M) | ||
| Document Type: Original Research | ||
| DOI: 10.48311/jast.2025.16821 | ||
| Authors | ||
| Nematollah Dayani1; Mohammad Chamani* 1; Parvin Shawrang2; Asa Ebrahimi3; Ali Asghar Sadeghi1 | ||
| 1Department of Animal Science, Science and Research Branch, Islamic Azad University, Tehran, Islamic Republic of Iran. | ||
| 2Nuclear Agriculture Research School, Nuclear Science and Technology Research Institute, Karaj, Islamic Republic of Iran. | ||
| 3Department of Biotechnology, Science and Research Branch, Islamic Azad University, Tehran, Islamic Republic of Iran. | ||
| Abstract | ||
| This study aimed to determine the effects of energy levels and sources on growth performance, antibody titers, and the gene expression of pro-inflammatory cytokines in broilers exposed to heat stress. A total of 450 one-day-old Ross chickens were assigned to six dietary treatments and five replicates in a completely randomized design. Chickens received diets differentiated by the main energy source (corn grain and soybean oil) and energy level (equal, 3% or 6% lower or higher than Ross 308 recommendation). Treatments were as follows: corn grain and equal as Control (CON), 3% lower corn grain (T1), 6% lower corn grain (T2), corn grain and soybean oil, equal (T3), 3% higher corn grain and soybean oil (T4), 6% higher corn grain and soybean oil (T5). The room temperature was increased to 34°C (6-h daily) from day 12 to 42 of age to induce heat stress. The highest corticosterone level was observed in T1, T2, and T5 groups. The lowest antibody titers were observed in T2 group and the highest expression levels of pro-inflammatory cytokines genes were in chickens receiving T5 diet. The highest Feed Conversion Ratio (FCR) during the grower and finisher periods was observed in T2, and the lowest in T3 and T4. It was recommended to feed Ross broiler with a diet containing oil instead of a part of grain based on energy recommended by the strain recommendation. | ||
| Keywords | ||
| Chicken; Corticosterone; Inflammation. Interleukin; Ross strain | ||
| References | ||
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