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Descripción
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| The effects of inclusion of oat hulls (OH) and sugar beet pulp (SBP) in the diet on total tract apparent of retention (TTAR) of nutrients were studied in broilers from 1 to 21 d of age. A control diet based on cooked rice that contained 3,260 kcal AMEn/kg and 1.6% crude fiber (CF) was diluted with 0, 2.5, 5.0, and 7.5% of either OH or SBP. Each treatment was replicated 6 times (a cage with 12 chicks). Digestive traits and nutrient retention were recorded at 7, 14, and 21 d of age, and jejuna histology at 14 d of age. Broilers fed additional fiber had heavier gizzards with higher digesta contents and lower pH than those fed the control diet (P ¿ 0.001). As the level of fiber increased the relative weight of the gizzard increased linearly (P ¿ 0.001) and gizzard pH was reduced (P ¿ 0.05). Broilers fed OH had heavier gizzards (P ¿ 0.001) with less digesta content (P ¿ 0.001) and higher pH (P ¿ 0.01) than those fed SBP. Villus height was reduced (P ¿ 0.05) and crypt depth tended to be shorter as the level of fiber increased. Also, the inclusion of SBP but not OH, reduced villus height: crypt depth ratio linearly (P ¿ 0.05). Fiber inclusion affected TTAR of nutrients in different manners depending on nutrient, type, and level of fiber considered. In general, the inclusion of 2.5% fiber improved nutrient digestibility with the effects being more pronounced with OH (P ¿ 0.001 for DM, N, and AMEn). However, the inclusion of 7.5% fiber reduced nutrient digestibility (P ¿ 0.001), especially when OH was used. We conclude that the inclusion of up to 7.5% OH or SBP increases the weight the gizzard and reduces its pH. The inclusion of 2.5% fiber improves TTAR of nutrients. However, a further increase to 7.5% has negative effects. Young chicks have a minimal requirement of at least 2.3% CF in the diet. | |
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Internacional
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Si |
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Nombre congreso
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99th Poultry Science Association Annual Meeting |
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Tipo de participación
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960 |
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Lugar del congreso
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Denver |
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Revisores
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No |
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ISBN o ISSN
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0-8134-2929-3 |
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DOI
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Fecha inicio congreso
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11/07/2010 |
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Fecha fin congreso
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15/07/2010 |
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Desde la página
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282 |
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Hasta la página
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282 |
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Título de las actas
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Poultry Science 89 (1): 282 |