海兰褐蛋鸡产蛋高峰至后期蛋壳品质的变化特征

马玲玲,冯嘉,王晶,齐广海,马友彪,武书庚,张海军,邱凯

The Changes of Eggshell Quality in the Laying Cycle of Hy-Line Brown Layers

MA LingLing,FENG Jia,WANG Jing,QI GuangHai,MA YouBiao,WU ShuGeng,ZHANG HaiJun,QIU Kai

表2 海兰褐蛋鸡产蛋高峰至后期蛋壳物理属性和力学特性的变化

Table 2 The changes of eggshell physical and mechanical properties of Hy-Line Brown layers from peak to late phase of production

项目 Items 蛋鸡周龄 Hen age (wk) P 31 36 41 46 50 55 60 65 70 75 80 蛋壳重 Eggshell weight (g) 5.91cd±0.25 5.99bcd±0.25 6.36a±0.24 6.34a±0.27 6.19abc±0.22 6.14abcd±0.37 6.27ab±0.14 5.89d±0.28 5.87d±0.14 6.07abcd±0.36 6.14abcd±0.20 < 0.001 蛋壳比例 Eggshell percentage (%) 9.79bc±0.34 9.91bc±0.36 10.31a±0.28 10.19ab±0.40 9.84bc±0.35 9.72c±0.19 9.92bc±0.22 9.28d±0.37 9.27d±0.30 9.56cd±0.40 9.56cd±0.33 < 0.001 蛋壳指数 Eggshell index (mg·mm-2) 8.15bc±0.34 8.24bc±0.32 8.74a±0.25 8.63a±0.36 8.36ab±0.30 8.09bc±0.49 8.44ab±0.19 7.91c±0.34 7.89c±0.23 8.15bc±0.43 8.18bc±0.28 < 0.001 蛋壳厚度 Eggshell thickness (×10-2mm) 45.39cde±0.83 45.61cde±0.93 44.89e±0.47 46.81a±0.68 46.56ab±0.21 45.45cde±0.75 45.87bcd±0.61 45.13de±0.93 43.86f±0.67 46.05abc±0.55 45.21de±0.85 < 0.001 蛋壳强度 Eggshell strength (N) 48.60a±2.79 46.68ab±2.46 46.19abc±1.47 47.60ab±2.60 45.18bcd±3.21 42.71d±2.80 43.55cd±2.35 36.01ef±3.74 38.55e±2.86 38.24ef±2.19 35.28f±2.26 < 0.001 蛋壳韧性 Eggshell fracture toughness (N/mm3/2) 390.65a±18.79 382.44ab±15.37 386.93ab±16.07 378.48ab±17.83 367.91b±11.93 326.70cd±11.87 336.69c±25.35 290.33f±21.47 315.68de±20.61 300.06ef±16.70 280.97f±10.27 < 0.001