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Effects of type and level of dietary fiber on digestive trait and nturients digestibility in broilers
Research Areas
  • Livestock
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.
99th Poultry Science Association Annual Meeting
Start Date
End Date
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Poultry Science 89 (1): 282
  • Autor: Gonzalo Gonzalez Mateos (UPM)
  • Autor: Rosa Pilar Lazaro Garcia (UPM)
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Producción Animal
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