RESUMO
The objective of the present study was to evaluate the effects of increasing doses of protease on broilers from 1 to 42 days of age. A total of 1290 Ross AP broilers were used, distributed among five treatments: positive control diet, negative control diet (NC), NC + 50 ppm of protease, NC + 100 ppm of protease, and NC + 200 ppm of protease. Each treatment contained six replicates of 43 animals each. The inclusion of proteases in the diet had effects (P < 0.05) on body weight, feed intake, weight gain, and feed conversion in the 12 to 21 day period; body weight, weight gain, and feed intake in the 29 to 42 day period; nutrient digestibility (energy metabolizability coefficient and crude protein at 28 days); and intestinal parameters (crypt and muscle width of jejunum and ileum at 28 days and villus length, crypt length, and jejunum thickness muscle layer at 42 days). These results indicate that the inclusion of protease in broiler feed can improve production parameters when the amount of crude protein in the diet is reduced.
Assuntos
Dieta com Restrição de Proteínas , Peptídeo Hidrolases , Animais , Peptídeo Hidrolases/metabolismo , Dieta com Restrição de Proteínas/veterinária , Galinhas/fisiologia , Dieta/veterinária , Nutrientes/fisiologia , Carne , Peso Corporal , Aumento de Peso , Ração Animal/análise , Suplementos Nutricionais , Fenômenos Fisiológicos da Nutrição AnimalRESUMO
RESUMEN Objetivo: caracterización organoléptica, nutricional, microbiológica y digestibilidad in vitro de ensilados de desperdicios de alimentos recolectados en un restaurante de un centro de estudios técnicos y tecnológicos con subproductos de cosecha. Metodología: se realizó un análisis organoléptico, microbiológico, proximal de la composición y digestibilidad in vitro de ensilajes con diferentes niveles de inclusión de desperdicios de alimentos. Resultados: se evidencian características de olor, color y textura óptimas para su palatabilidad, valores nutricionales favorables para el 30, 35 y 40% de inclusión de desperdicios, bajos promedios de proteína, pero con niveles de energía superiores a los del maíz, sorgo y soya. La digestibilidad in vitro de la materia seca (DIVMS) fue mejor para el 35% de inclusión. Así mismo, la Unidad Formadora de Colonias UFC/g para el día 21 fue 1 x10 (Escherichia coli), que se ajusta a las normas para alimentos de animales. Conclusiones: la utilización de ensilados con un 35% de inclusión de desperdicios de alimento puede ser una importante herramienta de suplementación para la alimentación porcina.
ABSTRACT Aim: characterize organoleptic, nutritional, microbiological and in vitro digestibility of food waste silage collected in a restaurant of a technical and technological studies center with harvest by-products. Metodology: it has been make organoleptic analysis, microbiologic, proximal composition, in vitro digestibility of silages with different levels of inclusion of food waste. Results: it is evidenced characteristics of smell, color and texture optimal so as to palatability, favorable nutritional values for 30, 35 and 40% inclusion of waste, low protein levels, but with hight energy levels superior to corn, sorghum and soybeans. The dry mater in vitro digestibility in vitro de la materia seca (DIVMS) was better for 35% inclusión. Moreover, In addition, the UFC/g colony forming units for 21th day was 1 X101 (Escherichia coli), that conforms to the standards for animal feed. Conclusions: to use silages with 35% inclusion of food waste may be one important tool of supplementation for swine feeding.