Garlich J D, James R L, Ward J B
Poult Sci. 1975 Jul;54(4):1193-9. doi: 10.3382/ps.0541193.
An experiment was conducted to determine the effects on laying hens of ingestion of a phosphorus deficient diet for 6, 9, or 21 days. Four experimental groups consisting of 3 replicates of 5 Leghorn pullets averaging 90 percent egg production were maintained in individual cages. A diet containing corn, soy, and meat and bone meal was formulated to contain 0.39 percent total P on a 90 percent dry matter basis (LP). A normal P diet (NP), 0.64 percent total P, was obtained by supplementation with an inorganic P source. Group 1 (Control) was fed the NP diet for 21 days. Groups 2, 3 and 4 were fed the LP diet for 6, 9, and 21 days respectively. Groups 2 and 3 resumed consumption of NP diet after 6 and 9 days. Individual egg production and egg weight were recorded daily. Individual hen determinations of serum P, g. shell/cm.2 surface area, and feed consumption by replicate were made at 3 or 4 day intervals. The serum P of Group 1 averaged 5.01 +/- 0.31 mg./100 ml. over the 21 days. Serum P was significantly reduced after 3 days of consuming the LP diet. Serum phosphorus of Groups 2,3, and 4 were 2.95 +/- 0.18, 3.03 +/- 0.24, 3.13 +/- 0.32 mg./100 ml. respectively after 6, 9, and 21 days of consuming the LP diet. Serum P returned to control levels within 4 days after resumption of the NP diet by Groups 2 and 3. There were no differences in feed consumption, egg production nor any detrimental effects on egg weight or shell calcification despite the low serum P. Body weight gain of the hens fed the phosphorus deficient diet for 21 days was significantly reduced. At the end of the experiment femur density was determined; the hens which had consumed the phosphorus deficient diet for 21 days had reduced femur density (osteoporous) compared to the control group or the hens fed the phosphorus deficient diet for only 9 days. It is concluded that pullets in 90 percent production can tolerate this low P diet for at least 9 days without apparent detrimental effects.
进行了一项实验，以确定给产蛋母鸡喂食6天、9天或21天缺磷日粮的影响。四个实验组，每组由3个重复、每个重复5只平均产蛋率为90%的来亨小母鸡组成，饲养在单独的笼子里。配制了一种含有玉米、大豆以及肉骨粉的日粮，在90%干物质基础上总磷含量为0.39%（低磷日粮）。通过添加无机磷源获得正常磷日粮（正常磷日粮），总磷含量为0.64%。第1组（对照组）喂食正常磷日粮21天。第2、3和4组分别喂食低磷日粮6天、9天和21天。第2组和第3组在6天和9天后恢复喂食正常磷日粮。每天记录个体产蛋量和蛋重。每隔3或4天对个体母鸡进行血清磷、蛋壳重量/平方厘米表面积以及按重复组测定采食量。第1组的血清磷在21天内平均为5.01±0.31毫克/100毫升。喂食低磷日粮3天后血清磷显著降低。第2、3和4组在喂食低磷日粮6天、9天和21天后血清磷分别为2.95±0.18、3.03±0.24、3.13±0.32毫克/100毫升。第2组和第3组恢复喂食正常磷日粮后4天内血清磷恢复到对照水平。尽管血清磷含量低，但采食量、产蛋量以及对蛋重或蛋壳钙化均无不利影响。喂食缺磷日粮21天的母鸡体重增加显著降低。在实验结束时测定股骨密度；与对照组或仅喂食缺磷日粮9天的母鸡相比，喂食缺磷日粮21天的母鸡股骨密度降低（骨质疏松）。得出的结论是，产蛋率为90%的小母鸡可以耐受这种低磷日粮至少9天而无明显不利影响。
