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espanolEn la actualidad hay restricciones para usar aditivos sinteticos en la produccion de pollo en varios paises, una alternativa es usar sustancias naturales pero tienen varias funciones y efectos sobre las aves. El objetivo de la investigacion fue evaluar tres niveles 0, 100 y 200 mg de propoleos por kg1 de alimento en aves de engorda durante 42 dias. El propoleo a 200 mg kg-1aumento la conversion alimenticia (CA) en aves de tres semanas de edad (P EnglishNowadays there are currently restrictions on the usage of synthetic additives in chicken production in several countries; an alternative is to use natural substances that could have different functions and effects on broiler. The objective of the research was to evaluate three levels of propolis (0, 100 and 200 mg per kg-1 of feed) in poultry for 42 days. Propolis at 200 mg kg-1 increased feed conversion (FC) in three-week old birds (P≤0.05), but at 100 mg kg-1 decreased weight gain (WG) in six-week old birds (P≤0.05). Propolis at both concentrations increased the amount of lymphocytes, heterophils and eosinophils in three-week old birds (P≤0.05) and monocytes in six-week old birds (P≤0.05). At 100 and 200 mg kg-1 of food the urea decreased in three-week old birds (P≤0.05), while at 200 mg kg-1 the cholesterol and triglyceride levels increased in six-week old birds (P≤0.05). In addition, at 200 mg propolis of kg-1 the oxidation of lipids in breast meat decreased (P≤0.05). The propolis added to the poultry feed did not increase the productive yield but the malondialdehyde present in breast meat decreased. |
