From 34 d of age until slaughtering (75 d), 246 hybrid rabbits were divided into six experimental groups and fed six diets ad libitum, according to a bi-factorial arrangement with three levels of starch (6.0%, 10.3%, and 14.7%) and two levels of soluble fibre (10.0% and 13.8%). When dietary starch was increased, the apparent digestibility of DM (54.7 to 62.9%) and all nutrients linearly increased (P<0.001). Weight gain and feed conversion linearly (P<0.001) improved (6.4% and 11.1%, respectively), and feed intake decreased (5.6%). A significant interaction (P=0.05) was observed for NDF digestibility: as the starch level increased, NDF digestibility improved less in the diets with 10.0% soluble fibre than in the diets with 13.8% soluble fibre. The increase of dietary soluble fibre improved (P<0.001) DM digestibility (54.0 to 63.9%) and daily growth (by 5.3%; P=0.05) and reduced feed intake and feed conversion (by 12.4% and 15.0%, respectively; P<0.001). In conclusion, the use of soluble fibre is recommended in association with, rather than in replacement of, starch to increase the energy value of diets and improve overall farm-feed efficiency.
Aumento del nivel de fibra soluble y almidón en dietas para conejos en crecimiento: efectos sobre la eficacia alimenticia y los rendimentos productivos
TROCINO, ANGELA;FRAGKIADAKIS, MICHAIL;MAJOLINI, DUILIO;TAZZOLI, MARCO;XICCATO, GEROLAMO
2011
Abstract
From 34 d of age until slaughtering (75 d), 246 hybrid rabbits were divided into six experimental groups and fed six diets ad libitum, according to a bi-factorial arrangement with three levels of starch (6.0%, 10.3%, and 14.7%) and two levels of soluble fibre (10.0% and 13.8%). When dietary starch was increased, the apparent digestibility of DM (54.7 to 62.9%) and all nutrients linearly increased (P<0.001). Weight gain and feed conversion linearly (P<0.001) improved (6.4% and 11.1%, respectively), and feed intake decreased (5.6%). A significant interaction (P=0.05) was observed for NDF digestibility: as the starch level increased, NDF digestibility improved less in the diets with 10.0% soluble fibre than in the diets with 13.8% soluble fibre. The increase of dietary soluble fibre improved (P<0.001) DM digestibility (54.0 to 63.9%) and daily growth (by 5.3%; P=0.05) and reduced feed intake and feed conversion (by 12.4% and 15.0%, respectively; P<0.001). In conclusion, the use of soluble fibre is recommended in association with, rather than in replacement of, starch to increase the energy value of diets and improve overall farm-feed efficiency.
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