外源酶对异育银鲫鱼种生长及表观消化率的影响研究

均重60.0g的异育银鲫鱼种300尾随机分为5组,即Ⅰ、Ⅱ、Ⅲ、Ⅳ、Ⅴ组,每组设3个重复。Ⅰ为对照组,饲喂基础日粮,Ⅱ、Ⅲ、Ⅳ、Ⅴ为试验组,分别在基础日粮中添加复合酶制剂250、500、750、1000mg/kg,饲喂60d。试验结果表明:添加外源酶能有效地改善异育银鲫对干物质、蛋白质及磷的消化吸收,其中以对改善磷的利用率最显著,以添加500～750mg/kg为佳,但超过750mg/kg时消化率有下降趋势;在异育银鲫饲料中添加500～750mg/kg外源酶制剂显著促进了异育银鲫的生长。而过量添加时,外源酶则会抑制异育银鲫生长。

Effects of exogenous enzymes on the growth and apparent digestivibility of allogynogenetic crucian carp fingerlings

Three hundreds Allogynogenetic crucian carp fingerlings (average weight 60.0 g) was divided into five groups randomly,namely Ⅰ,Ⅱ,Ⅲ,Ⅳ and Ⅴ group, everyone of which had three duplicates. The Ⅰgroup was contrast,fed with basic diet,the others were tested groups,fed with the basic diet added 250,500,750 and 1 000mg/kg "kemzeme" preparation respectively. Raised for 60 days, the results showed:It was effective for allogynogenetic crucian carp fingerlings to improve the digestivibility of the nutrition when the exogenous enzymes was added in the allogynogenetic crucian carp fingerlings diet, among which the effect of P was significant and the amount of exogenous enzymes between 500mg/kg and 750mg/kg, when the added amount was over 750mg/kg, there was a tendency to make the digestivibility decline; exogenous enzymes with the amount between 500mg/kg and 750mg/kg can significantly enchance the allogynogenetic crucian carp to grow, but when the amount was over 750mg/kg, it will inhibite Allogynogenetic crucian carp to grow.