sayedahmed, M. (2025). Performance and Carcass yields of Cobb Broilers Fed Different Dietary Programs and Bioactive Additives. Egyptian Poultry Science Journal, (), -. doi: 10.21608/epsj.2025.19560.1052
mahmoud mohamed sayedahmed. "Performance and Carcass yields of Cobb Broilers Fed Different Dietary Programs and Bioactive Additives". Egyptian Poultry Science Journal, , , 2025, -. doi: 10.21608/epsj.2025.19560.1052
sayedahmed, M. (2025). 'Performance and Carcass yields of Cobb Broilers Fed Different Dietary Programs and Bioactive Additives', Egyptian Poultry Science Journal, (), pp. -. doi: 10.21608/epsj.2025.19560.1052
sayedahmed, M. Performance and Carcass yields of Cobb Broilers Fed Different Dietary Programs and Bioactive Additives. Egyptian Poultry Science Journal, 2025; (): -. doi: 10.21608/epsj.2025.19560.1052
Performance and Carcass yields of Cobb Broilers Fed Different Dietary Programs and Bioactive Additives
Articles in Press, Accepted Manuscript, Available Online from 19 May 2025
Department of Poultry Production, Faculty of Agriculture, Alexandria University, Alexandria Egypt.
Abstract
The experiment was performed to evaluate the impact of feeding different dietary programs having different levels of metabolizable energy(ME) during starter period and those of finisher ones which were less than that of the commercial standard (3150kcal/kg) by 50, 100 and 150 kcal/kg with or without Bacillus amyloliquefaciens and energy enzymes on broilers productive performance and carcass characteristics. A total of 7300 Cobb 500 unsexed one-day-old chicks were used. All chicks were fed pre-starter diet contained 23% crude protein (CP) and 2950 kcal/kg ME during the phase of (1-7) days. Afterward, experimental groups consist of 18 feeding programs where each program consists of two phases. During starter phase (8 -17) days, birds fed experimental diets contained one level of CP(22%) with either of three ME levels (2950, 3000 or 3050 kcal/kg), whereas through the finisher phase (18 – 35) days birds received diets of one level of CP (21%) with either of the three graded ME levels 3100,3050 or 3000 kcal/kg with or without studied additives for each. Results shows that the best live body weight, body weight gain and feed conversion ratio (FCR) were observed in dietary program included starter diet of 3050 kcal/kg and finisher one of 3100 kcal/kg ME with additives inclusion compared with the worst FCR of dietary program contained starter diet of 2950 kcal/kg and finisher one of 3000 kcal/kg without additives. Carcass and abdominal fat weights were significantly improved (P ≤ 0.05) by either feed programs with additives compared with those un-supplemented and no significant effect on dressed and carcass cut weight was observed among dietary treatments. It can be concluded that, feeding dietary program included starter diet of 3050 kcal/kg and finisher ones of ME 50 kcal/kg reduction with bioactive additives had a beneficial effect on broiler productive performance and carcass yields.
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