饲粮锰水平对雏鸭生长及组织矿物元素的影响

Effect of Dietary Manganese Level on Tissue Mineral Concentrations and Growth for Ducklings

采用实用饲粮,选用1日龄北京雏鸭120只,随机分为4组,每组30只,锰添加水平依次为0,110,1000,3500ppm(试剂级MnSO_4·H_2O),试验3周,研究饲粮锰水平对雏鸭生长及其组织矿物元素代谢的影响.结果为,饲粮锰缺乏(含Mn 19ppm)不影响雏鸭体重和饲料转化率(P>0.05).锰过量(含Mn3519ppm)则影响雏鸭体重和饲料转化率(P<0.01).饲粮锰缺乏或过量均导致胫骨、肝、肾、胰和心肌组织锰含量改变(P<0.05或P<0.01),饲粮锰过量(3519ppm)降低骨Ca,Mg,Fe和肝与肾Fe(P<0.01),并提高肝Cu和Zn,肾Ca,胰Ca和Fe与心Mg含量(P<0.05或P<0.01),为进一步研究雏鸭锰营养作用提供了生物学试验依据.

An experiment was comducted to investigate the effect of manganese (Mn) level on tissue mineral concentrations and growth of ducklings by using conventional diet. One—day while Peking ducklings involving 120 were randomly divided into four groups of per thirty. The supplementations of Mn (reagent grade MnSO_4·H_2O) were 0, 110,1000 and 3 500 ppm respectively and fed libitum for three weeks. There were no differences (P > 0.05) in weight gain and feed conversion for dietary Mn deficiency (containing Mn 19 ppm), but significant (P<0.01) while supplying excess Mn (containing 3519 ppm) for ducklings. The Mn concentrations in tibia, liver, kidney, pancreas and heart were changed due to dietary Mn deficiency or excess (P<0.05 or P<0.01) . There were decrease concentrations of Ca, Mg, Fe in tibia and Fe in liver and kidney (P<0.01), and increase concentrations of Cu and Zn in liver, Ca in kidney, Ca and Fe in pancreas and Mg in heart with dietary Mn excess (P<0.05 or P<0.01) . Concentrations of some minerals in tissues determined were changed due to dietary Mn excess. The results gave the biological bases of Mn nutrition to be studied for ducklings.