【摘要】 作者于1983和1984年按2×2双因子设计,用147——300日龄白来航型星杂288品系母鸡,研究了两个钙水平(3.30与3.80％)和两个总磷水平(0.60和0.40％)的效果。试验一(1983)和试验二(1984)饲粮配方相同。差异是:试验一用的大豆饼是熟的,碳酸钙为试剂级;试验二用生大豆饼和饲料级碳酸钙。试验结果表明,获得0.60％磷的鸡淘汰率低;获得0.60％磷或3.30％钙的试鸡蛋,产量和饲料转化比均较得到0.40％磷或3.80％钙者为高(p<0.01或p<0.05)。两批试验共进行六次蛋壳品质测定,除试验一有两次测定显示出获得0.60％磷试鸡的蛋,其蛋壳率和单位面积蛋壳重显著低于获得0.40％磷的试鸡外;其余测定的全部指标在钙、磷水平间均无显著差异;本试验测出的蛋壳品质指标平均值,均属正常范围。更多还原

【Abstract】 The experimets conducted by the authors were designed acc ording to 2×2 two-factor method with white Leghorn type Shaver Starcross-288 hens in the age of 147-300 days to study the effects of two levels of Ca(3.30 and 3.80%) and two levels of total P(0.60 and 0.40％) in 1983 and 1984. Diet formulas were the same in both experiment 1(1983) and experiment 2(1984), but the soybean meal used in experiment 1 was cooked and the lime carbonate was in agent grade, however, soybean meal in experiment 2 was uncooked and lime carbonate was in feed grade. Results show that the culling rate for hens who got 0.60% P or 3.30％ Ca is lower, but the egg production and feed efficiency are higher than that for those who got 0.40％ P or 3.80％ Ca (P<0.01 or P<0.05). Data from six measurements for two sets of experiments also show that the shall ratio and weight in per unit area of shall from hens who got 0.60％ of P are lower significantly than that of those who got 0.40%P by two measurements in experiment 1, but all indexes from other measurments are showing no difference between levels of both calsium and phosphorus. Mean values for quality of egg shall measured in this experiment are all within a normal range.更多还原