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handle: 10261/241482
[ES]: Se ha estudiado el efecto de la adición de un preparado enzimático a raciones a base de cebada sobre distintos parámetros productivos y la calidad de la canal en pollos de aptitud cárnica. La concentración de 13-glucanos en la cebada fue de 3,97 % . Los tratamientos utilizados fueron: T-1 (control maíz-soja); T-2 (control cebada-soja); T-3 (T-2 más 150 ppm de enzima); T-4 (T-2 más 300 ppm de enzima). La inclusión del enzima a concentraciones de 150 y 300 ppm mejoró signifcativamente el peso vivo y el índice de transformación de las aves a los 28 y 49 días de edad, así como el consumo de agua a los 21 y 49 días. Las longitudes relativas del duodeno, yeyuno, íleon y ciegos se redujeron significativamente en las aves que consumieron las raciones T-I , T-3 y T-4 respecto de aquellas alimentadas con la ración T-2. La adición de enzimas no modificó el porcentaje de grasa abdominal, aunque si se observaron reducciones significativas cuando se comparó con la de las aves alimentadas con la ración T-I. No se observaron diferencias significativas en los distintos tratamientos respecto al rendimiento de la canal, pH al sacrificio, a las 5 y 24 horas, ni en la pigmentación de pechugas y tarsos. En conclusión la adición de enzimas con actividad 13 glucanasa mejora los parámetros productivos y no altera la calidad de la canal justificando plenamente su uso cuando se sustituye al maíz por cebada en raciones para pollos de aptitud cárnica.
[EN]: One experiment was conducted to study the effects of the addition of enzyme preparations (150 and 300 ppm) to diets containing barley for chicks. 13-glucan content of the barleywas 3.97%. The treatments were: T- I (control-soybean); T-2 (control barley-soybean); T-3 (T-2 plus 150 ppm of enzyme); T-4 (T-2 plus 300 ppm of enzyme). Addition of enzymes significantly improved body weight and feed conversion at 28 and 49 days of age. The consumption of water (21 and 49 days) was increased in the birds fed T-2 diet, the administration of enzymes reduced significantly this adverse effect. Relative intestinal length (duodenum, jejunun, ileum and cecum) were significantly reduced in the birds fed T- 1, T-3 and T-4 diets respect to those fed T-2 diet. Abdominal fat was not modified by the addition of enzymes but it was significantly reduced respect to the birds fed T-I diet. Regarding carcass yield, carcass pH (5 and 24h) and pigmentation, not clear differences could be found between broilers receiving feed with or without enzyme preparation. In conclusion, the addition of enzyme with a high 0-glucanase activity, improved the performance of the birds fed barley without alter the carcass yield and clearly justify their use in barley based diets for chickens.
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