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- W2064806688 abstract "From 29 d of age until slaughter (78 d), 246 hybrid rabbits were divided into six experimental groups and fed six diets ad libitum according to a bi-factorial arrangement with two soluble fibre-to-starch ratios (0.5 and 1.1), obtained by replacing starch (from 178 to 130 g/kg) with soluble fibre (from 84 to 141 g/kg), and three levels of crude protein (139, 154, and 172 g/kg diet). Growth traits were recorded on all rabbits; total tract apparent digestibility coefficients (CCTAD) were measured on 72 rabbits. Gut traits were obtained from further 36 rabbits slaughtered at 38 d of age. The increase in the soluble fibre-to-starch ratio increased (P < 0.001) the CTTAD of the dry matter (0.605–0.670) and almost all nutrients and decreased (P < 0.001) feed intake (7.0%) and feed conversion (8.4%) over the whole trial. The increase in the soluble fibre-to-starch ratio decreased the pH (5.87–5.71, P < 0.05) and the ammonia-N level (4.72–2.33 mmol/L; P = 0.001), and increased the total volatile fatty acid (VFA) content (64.0–78.4 mmol/L; P < 0.01) of the caecal contents. When the crude protein concentration was increased, the CTTAD of almost all nutrients increased linearly (P < 0.01), the daily growth rate (5.3%; P < 0.001) increased, and the feed conversion decreased (4.7%; P < 0.001). At slaughter, a higher dietary protein level was associated with a greater live weight of animals (2729–2840 g; P < 0.01) and carcasses. The proportion of the gastro-intestinal tract decreased (190–184 g/kg slaughter weight; P < 0.05) and the dressing percentage increased (60.1–60.7% slaughter weight; P < 0.05). In the caecum, the total VFA level linearly increased from rabbits fed low-protein diets to rabbits fed high-protein diets (61.2–78.4 mmol/L; P < 0.01). Neither the dietary soluble fibre-to-starch ratio nor the protein level affected the health status of the rabbits or the morphology of the gut mucosa. In conclusion, the use of diets with high soluble fibre concentrations (141 g/kg) and low starch concentrations (130 g/kg) enhanced the digestive efficiency, growth performance, and caecal fermentation of growing rabbits, despite the moderate level of acid detergent fibre (ADF: 164 g/kg). In contrast, reducing the amount of dietary protein from 172 to 139 g/kg decreased the growth performance and caecal fermentation activity of rabbits. In the tested range, the soluble fibre-to-starch ratio and the protein level did not show relevant interactions, and the health status was not affected by these dietary treatments." @default.
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- W2064806688 date "2013-03-01" @default.
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- W2064806688 title "Soluble fibre, starch and protein level in diets for growing rabbits: Effects on digestive efficiency and productive traits" @default.
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- W2064806688 doi "https://doi.org/10.1016/j.anifeedsci.2013.01.007" @default.
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