不同锰源及锰水平对雏鸭肝脏脂肪沉积的影响

EFFECTS OF DIFFERENT LEVEL AND SOURCE OF SUPPLEMENTAL MANGANESE ON FAT DEPOSINLIVER FOR DUCKLINGS

选用１日龄北京雏鸭３００只，研究不同锰源及其锰添加水平对雏鸭肝脏脂肪沉积和肝锰含量的影响。试验１随机分为７组，每组３０只试鸭，在基础饲粮中（含Ｍｎ１９ｍｇ／ｋｇ），钙源及锰添加水平依次为４５、８５、１３５ｍｇ／ｋｇ（试剂级ＭｎＳＯ＿４·Ｈ＿２Ｏ或ＭｎＣＯ＿３）。试验２随机分４组，每组３０只试鸭，在基础饲粮上（含Ｍｎ１９ｍｇ／ｋｇ），补锰水平依次为０、１１０、１０００、３５００ｍｇ／ｋｇ（试剂级ＭｎＳＯ＿４·Ｈ＿２Ｏ），试验３周。结果为：锰源不影响雏鸭肝脏脂肪沉积，肝锰含量和千克活体肝重（Ｐ＞０．０５），锰缺乏（含Ｍｎ１９ｍｇ／ｋｇ）或锰过量（补Ｍｎ３５００ｍｇ／ｋｇ）均影响雏鸭肝脏脂肪沉积和肝锰含量变化（Ｐ＜０．０５或Ｐ＜０．０１）。综合试验结果为：如以肝锰变化作为机体锰营养状况评定指标，则饲粮锰适宜添加量为８５～１３５ｍｇ／ｋｇ。

one day old Peking ducklings were involved in the current experiment to study the effects of different levels and sources of supplemental manganese(Mn)on fat retention and Mn concentration in liver. Thebasal diet(containing l9 mg/kg Mn)were supplemented with 45, 85 and 135 mg/kg Mn (reagent grade MnSO_4·H_2O or MnCO_3)for experiment 1 and with 110,1000 and 3500 mg/kg Mn(reagent grade MnSO_4· H_2O)forexperiment 2 for three weeks respectively. The results showed that Mn Sources have no significant effects on liverMn concentration,fat retention and liver weight/kilo weight gain(P>0.05).Dietary Mn deficiency(containing 19mg/kg Mn)or excess(supplying 3500 mg/kg Mn)affected the Mn concentration and fat retention in the liver ofducklinkys(P<0.05 or P<0.01).The supplemnentations of dietary Mn recommend to be 85 to 135 mg/kg if the liverMn concentration is used as the nutrition index in animal.