Optimizing feed efficiency and nitrogen excretion in growing rabbits by increasing dietary energy with high-starch, high-soluble fibre, low-insoluble fibre supply at low protein levels

摘要: A total of 282 crossbred rabbits both genders were divided into six experimental groups and fed ad libitum diets formulated in a 2×3 factorial arrangement based on three dietary energy levels (low, approximately 8.45 MJ/kg; medium, 9.9 MJ/kg: high, 11.5 MJ/kg) two crude protein (15% 17%). The increase was obtained by simultaneous starch (9.1%, 13.7%, 17.9%) soluble fibre (4.8%, 7.1%, 9.4%) at the expense acid detergent (23.0%, 18.0%, 13.5%). Growth performance nitrogen excretion from weaning until slaughter, digestive traits monitored. enhanced apparent digestibility dry matter (50.8%, 60.5%, 71.5%; P<0.001), gross (50.3%, 59.7%, 70.7%; (73.1%, 77.8%, 82.9%; P<0.10), neutral (16.1%, 29.0%, 48.1%; P<0.001). In caecum, volatile fatty (VFA) content increased (63.0, 79.2, 78.5 mmol/L; P<0.05), propionate rate decreased (4.0%, 4.2%, 3.5% mol VFA; P<0.05); jejunum, villi-to-crypt ratio tended to decrease (4.18, 3.89, 3.57; P<0.10). supply feed intake (181 g/d, 157 g/d, 135 g/d; which improved conversion ratios (3.98, 3.40, 2.87; (3.15 g/d, 2.56 g/d, 1.93 g/d; significantly mortality (15.8%, 4.9%, 4.9%; P<0.05). When 15% 17%, for matter, protein, fibre, (P<0.01). during trial not affected, but (2.73 g/d vs. 2.37 g/d; conclusion, replace insoluble optimized efficiency controlled growing with positive effects health. reduction level determined be an useful strategy reduce farm excretion.