From 29 d of age until slaughter (78 d), 282 rabbits were fed six diets formulated in order to evaluate the combined effect of dietary protein level (CP: 13.9 vs. 15.4 vs. 17.5%) and soluble fibre to starch ratio (0.5 vs. 1.1). Health status was good in all groups. When dietary CP decreased, diet DM digestibility, daily growth rate and caecal volatile fatty acid (VFA) concentration significantly decreased. When soluble fibre to starch ratio increased, diet DM and fibre fractions digestibility significantly raised, feed intake decreased and feed conversion improved; at caecum, VFA concentration increased and N-ammonia level diminished. In conclusions, decreasing dietary CP until 13.9% impaired rabbit growth, while replacing starch with soluble fibre had advantages on both performance and caecal fermentations.
Riduzione del livello proteico e aumento del rapporto fibra solubile/amido in diete per conigli in accrescimento
TAZZOLI, MARCO;MAJOLINI, DUILIO;TROCINO, ANGELA;XICCATO, GEROLAMO
2011
Abstract
From 29 d of age until slaughter (78 d), 282 rabbits were fed six diets formulated in order to evaluate the combined effect of dietary protein level (CP: 13.9 vs. 15.4 vs. 17.5%) and soluble fibre to starch ratio (0.5 vs. 1.1). Health status was good in all groups. When dietary CP decreased, diet DM digestibility, daily growth rate and caecal volatile fatty acid (VFA) concentration significantly decreased. When soluble fibre to starch ratio increased, diet DM and fibre fractions digestibility significantly raised, feed intake decreased and feed conversion improved; at caecum, VFA concentration increased and N-ammonia level diminished. In conclusions, decreasing dietary CP until 13.9% impaired rabbit growth, while replacing starch with soluble fibre had advantages on both performance and caecal fermentations.Pubblicazioni consigliate
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