Tobias Steinera, Lidija Peric, Sinisa Bjedov, Niko Milosevic
The effects of dietary supplementation with two phytogenic feed additives (PFA) on performance parameters were investigated using 1200 mixed sex broilers fed standard diets or diets with reduced energy and amino acid concentrations. Birds were assigned to 6 treatments with 5 replications each and either fed a standard basal diet or a re-formulated basal diet with 1.5% reduced energy and amino acid concentrations. Treatments were: (1) Standard diet; (2) as 1 + PFA-1; (3) as 1 + PFA-2; (4) Re-formulated diet; (5) as 4 + PFA-1; (6) as 4 + PFA-2. PFA-1 was a blend of essential oils from oregano, anise and citrus adsorbed to an organic carrier (dosage: 0.125 g/kg) and PFA-2 was blend of essential oils from oregano, thyme, anise and citrus, encapsulated in a carbohydrate matrix (dosage: 0.1 g/kg).
Live weight was affected by diet (standard vs. re-formulated) at 14 (p<0.05) and 42 days of age (p<0.01). Supplementation of the standard diets with both PFAs increased (p<0.05) live weight at 42 days. Throughout the experiment live weight of birds fed the re-formulated diets was numerically lower compared to birds fed the standard diet, being significantly lower (p<0.05) at 14 days. Mortality and FCR did not differ between treatments. In conclusion, moderate reformulation of diets for energy and amino acids reduced broiler growth rates. Furthermore, supplementation of the diets with PFA improved live weight, hence confirming a growth promoting effect of essential oils in broilers.
کد مقاله : DPP-004
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