钙磷水平变化对锰利用的影响。

Effect of varying calcium and phosphorus level on manganese utilization.

作者信息

Wedekind K J, Baker D H

机构信息

Department of Animal Sciences, University of Illinois, Urbana 61801.

出版信息

Poult Sci. 1990 Jul;69(7):1156-64. doi: 10.3382/ps.0691156.

DOI:10.3382/ps.0691156

PMID:2235834

Abstract

Two experiments were conducted to evaluate the effect of varying levels of excess Ca and P on manganese (Mn) utilization. The criterion used to study the Mn-antagonizing effects of excess Ca and P was the regression of total tibia Mn on supplemental Mn intake. In Experiment 1, high supplemental levels of Mn were fed (0, 500, and 1,000 mg Mn per kg); in Experiment 2, lower Mn levels were fed (0, 50, and 100 mg Mn per kg). Supplements were added to a corn-soybean meal diet containing 1.1% Ca, .7% (.5% available) P, and 37 mg Mn per kg. In Experiment 1, a 3 x 3 x 3 factorial arrangement of treatments (four replicates) was used. Treatments were as follows: 0, .5, and 1.0% excess Ca as feed-grade ground limestone; 0, .4, and .8% excess P as KH2PO4; and 0, 500, and 1,000 mg Mn per kg as MnSO4.H2O. Total tibia Mn was depressed by P (P less than .0001) but not by Ca (P greater than .05). Compared with the standard (no added P), .4% P reduced Mn utilization by 22%, whereas .8% P reduced it by 38%. Manganese supplementation was found to ameliorate the growth-depressing effect of .8% supplemental P. Results of Experiment 2 agreed with the results in Experiment 1, providing evidence that bioavailability estimates obtained from experiments containing high levels of Mn can be extrapolated to diets containing lower levels. Results from Experiment 2 indicated that, relative to the standard (no added P), .22, .44 and .88% excess P reduced Mn utilization by 16, 22 and 31%, respectively.

摘要

进行了两项试验以评估不同水平的过量钙和磷对锰（Mn）利用率的影响。用于研究过量钙和磷对锰的拮抗作用的标准是胫骨总锰量对补充锰摄入量的回归关系。在试验1中，投喂了高补充水平的锰（每千克0、500和1000毫克锰）；在试验2中，投喂了较低水平的锰（每千克0、50和100毫克锰）。将补充剂添加到含有1.1%钙、0.7%（0.5%有效）磷和每千克37毫克锰的玉米-豆粕型日粮中。在试验1中，采用了3×3×3析因处理安排（四个重复）。处理如下：作为饲料级磨碎石灰石的0、0.5和1.0%过量钙；作为KH2PO4的0、0.4和0.8%过量磷；以及作为MnSO4·H2O的每千克0、500和1000毫克锰。胫骨总锰量受磷的抑制（P＜0.0001），但不受钙的抑制（P＞0.05）。与标准（不添加磷）相比，0.4%的磷使锰利用率降低了22%，而0.8%的磷使其降低了38%。发现补充锰可改善0.8%补充磷对生长的抑制作用。试验2的结果与试验1的结果一致，证明从含有高水平锰的试验中获得的生物利用率估计值可以外推到含有较低水平锰的日粮中。试验2的结果表明，相对于标准（不添加磷），0.22%、0.44%和0.88%的过量磷分别使锰利用率降低了16%、22%和31%。