Choi J H, Miles R D, Harms R H
Poult Sci. 1979 Jan;58(1):99-103. doi: 10.3382/ps.0580099.
In the first 2 experiments, laying hens were fed a diet containing .30% phosphorus for a preliminary period of 3 days. At the beginning of the experimental period, hens were fed .30, .75, or 1.40% phosphorus with 3.50% calcium. Another group of hens was fed .75% phosphorus and 1.40% calcium. Specific gravity of the eggs and blood serum inorganic phosphorus were determined and compared with those from control hens continuously fed a diet containing .75% phosphorus and 3.50% calcium. Both high phosphorus and/or low calcium decreased the specific gravity of eggs and increased the serum phosphorus level. In experiment 2, hens were fed different levels of phosphorus at different times of the day. Birds receiving 1.40% phosphorus between 0700 and 0930 hr and .30% phosphorus between 0930 and 2000 hr (Treatment 2) laid eggs with higher specific gravity than hens fed .30% phosphorus between 0700 and 0930 hr and 1.40% phosphorus between 0930 and 2000 hr (Treatment 3). there was no further improvement in egg shell quality over that from hens fed .75% phosphorus for both time periods (0700 to 2000 hr). In both experiments it was apparent that the dietary phosphorus level affected egg shell quality.
在前两个实验中，蛋鸡在为期3天的预饲期被饲喂含0.30%磷的日粮。在实验期开始时，给蛋鸡饲喂含3.50%钙、磷含量分别为0.30%、0.75%或1.40%的日粮。另一组蛋鸡被饲喂含1.40%钙和0.75%磷的日粮。测定鸡蛋的比重和血清无机磷，并与持续饲喂含0.75%磷和3.50%钙日粮的对照蛋鸡的相应指标进行比较。高磷和/或低钙均降低了鸡蛋的比重并提高了血清磷水平。在实验2中，在一天的不同时间给蛋鸡饲喂不同水平的磷。在07:00至09:30时接受1.40%磷且在09:30至20:00时接受0.30%磷的蛋鸡（处理2）所产鸡蛋的比重高于在07:00至09:30时接受0.30%磷且在09:30至20:00时接受1.40%磷的蛋鸡（处理3）。在两个时间段（07:00至20:00时），蛋壳质量均未比饲喂0.75%磷的蛋鸡有进一步改善。在两个实验中，日粮磷水平显然影响蛋壳质量。
