日粮能氮比对燕山绒山羊生长性能及 营养物质表观消化率的影响

张继伟,高昆,张英杰,刘月琴,段春辉

Effects of Diets with Energy-to-Nitrogen Rations on Growth Performance and Nutrients Apparent Digestibility in Growing Yanshan Cashmere Goat

ZHANG JiWei,GAO Kun,ZHANG YingJie,LIU YueQin,DUAN ChunHui

表5 不同能氮比对25—35 kg燕山绒山羊氮代谢的影响

Table 5 Effects of different energy-to-nitrogen rations on nitrogen metabolism of Yanshan cashmere goats from 25 kg to 35 kg BW

项目 Items 摄入氮 NI (g?d-1) 粪氮 FN (g?d-1) 尿氮 UN (g?d-1) 消化氮 DN (g?d-1) 氮沉积 NR (g?d-1) 氮消化率 DN/NI (%) 净蛋白利用率NPU (%) 组别 Groups Ⅰ组 22.60±1.54bcd 8.05±0.74a 6.64±2.46ab 14.55±1.06cde 7.92±2.89 64.40±1.95e 35.05±12.22 Ⅱ组 24.55±2.48abc 7.97±0.97a 6.92±1.48ab 16.58±1.78bcd 9.66±3.14 67.52±2.45cde 38.72±8.74 Ⅲ组 26.81±1.94ab 7.46±0.52ab 8.75±1.58a 19.35±1.98a 10.61±2.61 72.08±2.69ab 39.31±8.00 Ⅳ组 20.82±2.12d 7.06±0.98abc 6.77±1.77ab 13.77±1.41e 7.00±2.08 66.14±2.46de 33.66±9.36 Ⅴ组 23.28±2.95bcd 6.93±1.01abc 7.62±1.61ab 16.36±2.13bcde 8.74±0.81 70.27±2.01abc 37.70±2.51 Ⅵ组 24.93±1.22a 7.68±0.65a 8.85±0.74a 17.26±0.81ab 8.41±0.76 69.22±1.68bcd 33.77±2.51 Ⅶ组 20.35±1.36d 6.15±0.86c 5.84±0.80b 14.20±0.58de 8.36±1.22 69.89±2.40abc 41.02±4.55 Ⅷ组 21.13±2.71cd 6.33±0.51bc 6.91±0.56ab 14.80±2.24bcde 7.89±2.71 69.90±1.75abc 36.56±8.54 Ⅸ组 23.34±2.30bcd 6.33±0.60bc 7.32±1.12ab 17.02±1.74abc 9.70±2.34 72.88±0.84a 41.15±6.64 P值 P value 能量Energy 0.007 <0.001 0.208 0.089 0.348 0.005 0.363 蛋白Protein 0.001 0.964 0.013 <0.001 0.157 <0.001 0.886 能量×蛋白 Energy×protein 0.941 0.493 0.909 0.563 0.772 0.034 0.714 主效应 Main effects 能量 Energy 低Low 24.66±2.56a 7.83±0.74a 7.43±1.96 16.83±2.54a 9.39±2.86 68.00±3.94b 37.70±9.11 中Medium 23.01±2.67ab 7.22±0.88a 7.75±1.58 15.79±2.08ab 8.05±1.46 68.54±2.62b 35.04±5.69 高High 21.61±2.39b 6.27±0.62b 6.69±1.01 15.34±1.97b 8.65±2.12 70.89±2.18a 39.58±6.52 蛋白 Protein 低Low 21.26±1.84b 7.09±1.13 6.41±1.69b 14.17±1.03c 7.76±2.05 66.81±3.16c 36.58±9.02 中Medium 22.99±2.87b 7.08±1.05 7.15±1.23ab 15.91±2.04b 8.76±2.33 69.23±2.28b 37.66±6.58 高High 25.03±2.25a 7.15±0.82 8.30±1.30a 17.87±1.81a 9.57±2.09 71.39±2.37a 38.08±6.57