Influência de enzimas exógenas degradaroras de polissacarídeos não amiláceos no crescimento, parâmetros sanguíneos e qualidade de carcaça de frangos de corte alimentados com dietas à base de milho e de trigo/cevada
DOI:
https://doi.org/10.17533/udea.rccp.v30n4a04Palavras-chave:
características de carcaça, cereais, NSP-asas exógenas, eficiência alimentar, nutrição avícolaResumo
Antecedentes: Embora o uso de enzimas degradadoras de polisacarideos não amiláceos (NSPasas) em dietas de frangos de corte à base de milho, aveia, centeio, cevada ou trigo já venha a ser estudada há varios anos, pouca atenção tem sido dada à mistura de trigo e cevada como matérias-primas básicas para a ração de frangos. Objetivos: Avaliar o efeito de diferentes níveis de enzimas NSP comerciais em dietas à base de milho e à base da mistura de trigo/cevada sobre o desempenho produtivo, a qualidade da carcaça e os parâmetros bioquímicos sanguíneos em frangos de corte. Métodos: Trezentos frangos de corte machos de 1 d de idade (Ross-308) foram alimentadas com duas dietas basais (uma à base de milho e outra à base de trigo e cevada), dois produtos enzimáticos comerciais (Kemin® e Rovabio®) e dois níveis dessas enzimas (0,025 e 0,05%), num arranjo fatorial 2×2×2, de 1 a 42 d de idade. Resultados: Em geral, as aves alimentadas com dietas à base de milho (com ou sem suplementação enzimática) consumiram mais alimentos (p < 0,05) ao longo do experimento, apresentaram maior ganho de peso (p < 0,05) e menor RRF (p < 0,05) em comparação com a dieta à base de trigo/cevada (com ou sem suplementação enzimática). No entanto, quando as enzimas foram fornecidas, o FCR não melhorou em aves alimentadas com a dieta à base de milho. Em contraste, em aves alimentadas com trigo/cevada, o peso corporal aumentou e a conversão alimentar melhorou (p < 0,05) com inclusão de 0,05% de NSPasas. Os tratamentos dietéticos não afetaram as características econômicas da carcaça (p > 0,05), enquanto os parâmetros bioquímicos do sangue, como glicose, colesterol, VLDL e HDL, mudaram (p < 0,05) ao incorporar enzimas na dieta. Conclusão: Os resultados confirmam a bioeficiência da inclusão de xilanases e glucanases nas dietas à base de trigo e cevada, ricas em NSPasas, o que poderá trazer benefícios económicos para o produtor.
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