PERFORMANCE AND CARCASS YIELDS OF COBB 500 BROILERS FED DIFFERENT DIETARY PROGRAMS AND BIOACTIVE ADDITIVES | ||
| Egyptian Poultry Science Journal | ||
| Article 9, Volume 39, Issue 4, December 2019, Pages 851-864 PDF (672.5 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/epsj.2019.67505 | ||
| Authors | ||
| Mona Osman1; M. M., Sayed ahmed2; A. A. Eldeek2; A. M Safwat2 | ||
| 1Department of Poultry Production, Faculty of Agriculture, Alexandria University, Alexandria Egypt. | ||
| 2Dep. of Poult. Prod., Fac. of Agric., Alexandria Uni., 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 (3150 kcal/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 ME /kg 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 constant 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 constant level of CP (21%) with either of the three graded ME levels being 3100, 3050 or 3000 kcal/kg with or without studied additives for each. Results showed 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 ME/kg and finisher one of 3100 kcal ME/kg with additives inclusion compared with the worst FCR of dietary program included starter diet of 2950 kcal ME/kg and finisher one of 3000 kcal ME/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. Furthermore, and no significant effects on dressed and carcass cut weight were observed among dietary treatments. It can be concluded that, feeding dietary program included starter diet of 3050 kcal ME/kg with 22% CP and finisher one of 21% CP and 3100 kcal ME/kg (50 kcal/kg less than recommended) with bioactive additives had a beneficial effect on broiler productive performance and carcass yields. | ||
| Keywords | ||
| performance; carcass; Feeding programs; Bioactive additives | ||
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