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Angela Riemenspergera; RenataUrbaitytea; Sigrid Pasteiner; Fernando GuilhermePerazzo Costa

In the current study the effects of feeding a mixture of organic acids (OA), a phytochemical (Ph) and a permeabilising substance (P) on growth performance of broilers were investigated in 300 1-d-old Cobb broiler chicken. Birds were divided into 2 groups and fed 2 different diets for 6 weeks. Group 1: control (without OA, Ph, P); group 2: experimental (supplemented with OA, Ph, P mixture at 1kg/t of feed). Final body weight (FBW; g/bird) was significantly increased in group 2 compared to the control group (p<0.05; 2630.0 vs 2756.7). Feed intake (FI; g/bird) was higher in the experimental group (4453.3 vs 4585.0), but differences were not significant (p>0.05). Also improvements in daily weight gain (DWG; g/bird) found in birds fed the experimental diet compared to birds fed the control diet were significant (p<0.05; 64.7 vs 61.6). Feed conversion ratio (FCR) of birds in the experimental group was improved compared to the control group (1.69 vs 1.74). Also the results for FCR did not differsignificantly (p>0.05) between the groups. Liveability was with 94.7% higher in the control group compared to the experimental group (94.0%). However, EPEF was significantly higher (p<0.05) in the experimental group compared to the control group (353 vs 331). In conclusion, the addition of a mixture of organic acids, a phytochemical and a permeabilising substance did improve growth performance of broiler in a 42 day period.

 

 

 

 

 

 

 

 

 

 

 

 

 کد مقاله : BTP-002

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IridaPalamidi, VasileiosParaskeuas, Georgios Theodorou, RenataBreitsma, GerdSchatzmayr, Georgios Theodoropoulos, Konstantinos Fegeros and Konstantinos C. Mountzouris

The effect of dietary acidifier (AC) supplementation in combination or not with avilamycin (AV) was evaluated on broiler performance, nutrient digestibility, gizzard pH, activity of digestive enzymes and relative expression of cytokines. A 2×2 factorial experimental design with inclusion of AC (0 and 1 g/kg of diet) and AV (0 and 2.5 mg/kg of diet) as the main factors was implemented. Subsequently, 544-day-old male Cobb broilers were allocated in four treatments (i.e. C – no additions, AC; AV and ACAV), each having eight replicates of 17 broilers, for 6 weeks. Overall bodyweight gain (BWG) was improved (PAC = 0.035) by AC addition. BWG and feed conversion ratio were improved (P < 0.05) by AV addition in all growth periods and overall. Dry matter, organic matter digestibility and energy retention were improved by AC (PAC = 0.050, PAC = 0.045 and PAC = 0.020, respectively), or AV (PAV = 0.018, PAV = 0.013 and PAV = 0.012, respectively). In addition AV supplementation improved digestibility of ether extracts (PAV = 0.022) and crude protein (PAV = 0.042). Pancreatic trypsin activity was lower in AC (PAC = 0.027) or AV (PAV < 0.001) supplemented diets. An AC • AV effect on gizzard pH (PAC • AV = 0.034) was noted. Expression of interferon-g (PAV = 0.010), interleukin (IL) 18 (PAV = 0.048) and inducible nitric oxide synthase 2 (PAV = 0.035) in spleen were downregulated by AV. An upregulation of IL10 (PAC • AV = 0.018), IL18 (PAC×AV = 0.002) and IL22 (PAC×AV = 0.030) in the caecal tonsils was shown for the combined ACAV supplementation. In conclusion, dietary AC supplementation improved performance, nutrient digestibility and energy retention, irrespective of AV inclusion. This study has provided evidence for potential links between digestive and immune function indices with growth performance improvements.

 

 کد مقاله : BTP-001

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A. Kovàcs, R. Urbaityte, N. Roth, and S. Weidong

Permeabilizing substances can improve the efficacy of organic acids and phytochemicals.An experiment was conducted to study the effects of dietary supplementation with a conventional acidifier versus a blend of organic acids combined with cinnamaldehyde and a permeabilizing substance (Biotronic Top3, Biomin, Austria) on growth performance, livability and cecum microbiota. Six hundred day-old AAbroiler chicks were randomly assigned to 3 treatments with 4 replicates in each treatment and 50 broilers per replicate. A negative control group received a standard diet, whereas trial group I diet was supplemented with 2 kg of the conventional acidifier and trial group II diet with 1 kg of the combined product. The feeding trial lasted for 42 d. Eight animals from each group were randomly selected and slaughtered at 21 and 42 d of age. Growth performance and mortality rates were recorded. The counts of E. coli, Salmonella, Clostridium perfringens, and lactobacilli, in the cecal content were analyzed. Conventional acidifier and combined product significantly increased the final weight and average daily gain while decreasing the feed conversion ratio and mortality (P < 0.05). The counts of E. coli, Salmonella and Clostridium perfringens (P < 0.05) were significantly decreased and lactobacilli (P < 0.1) increased in both trial groups compared with the control. These results indicated that the conventional acidifier as well as the combined product reduced mortality and improved growth performance in broilers by changing the intestinal microbiota. However, the blend of organic acids combined with antimicrobial substances was more beneficial, having a higher antimicrobial efficacy in a lower dose.

 

 

کد مقاله : BTP-003

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