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Effect of dietary energy source and level on the performance, antibody titers and the relative expression of IL-2 and IL-6 gene in broilers under heat stress
Nematollah Dayani1 , Mohammad Chamani * 2, Parvin Shawrang3 , Asa Ebrahimi4 , Ali Asghar Sadeghi1
1- Department of Animal Science, Science and Research Branch, Islamic Azad University
2- Islamic Azad University, Science and Research Branch , poultsci@gmail.com
3- Nuclear Agriculture Research School, Nuclear Science and Technology Research Institute
4- Department of Biotechnology, Science and Research Branch, Islamic Azad University
Abstract:   (92 Views)
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. 450 one-day-old Ross chickens were assigned to six dietary treatments and five replicates in a completely randomized design. Chickens have received diets differentiated by 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), corn grain, 3% lower (T1), corn grain, 6% lower (T2), corn grain and soybean oil, equal (T3), corn grain and soybean oil, 3% higher (T4), corn grain and soybean oil, 6% higher (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 the T1, T2, and T5 groups. The lowest antibody titers were observed in the 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 FCR was observed in T3 and T4 groups. It was recommended to feed Ross broiler chickens 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
Full-Text [PDF 420 kb]   (76 Downloads)    
Article Type: Original Research | Subject: Animal Nutration
Received: 2024/01/30 | Accepted: 2024/01/1
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