饲料中不同蛋能比对黄金鲫幼鱼生长和体组成的影响

Effect of dietary protein to energy ratios on growth and body composition of juvenile gold carp,Carassius auratu

试验旨在研究不同蛋白能量比的饲料对黄金鲫幼鱼生长和体组成的影响。以初始体重为(7.50±0.02)g的黄金鲫幼鱼为试验对象,随机分为9组,每组设3个重复,每个重复30尾鱼,分别投喂由3种不同的蛋白水平(30%、35%、40%)和3种不同的脂肪水平(6%、8%、10%)组成的9种不同蛋能比(从21.6~30.9 mg/kJ)的试验饲料,进行为期8周的生长试验。结果表明,饲料蛋白水平显著影响黄金鲫的生长、饲料效率和蛋白质效率(P<0.01),随着饲料蛋白含量的增加,黄金鲫的增重率和特定生长率显著提高,最高值均发生在蛋白/脂肪为40/10(29.2 mg/kJ)组,显著高于饲料蛋白含量为30%的各组(P<0.05),与蛋白含量为35%的各组之间没有显著差异(P>0.05)。同样的,饲料效率随着蛋白含量的增加也显著提高,蛋白/脂肪为35/8(26.5 mg/kJ)和40/10组的饲料效率最高。蛋白质效率最高值发生在蛋白/脂肪为35/8组,显著高于蛋白含量为40%的处理组,但与其它组没有显著差异。饲料不同蛋能比对鱼体水分没有显著影响,鱼体脂肪含量与饲料脂肪含量正相关。综合试验结果,黄金鲫适宜的蛋能比水平为25.5~26.5 mg/kJ,蛋白质为35%,脂肪为6%~8%。

rowth experiment was conducled Io determine the optimal dietary prolein to eflevgy （P/E） ratio for juvenile gold carp linitial average weight （7.5＋0.02） g]. Nine practical diets were fi）rmulated to contain three prolein levels（30%. 35% and 40%）, each with three lipid levels （6%, 8% and 10%）, in order to produce a range of P/E ratios（from 21.6 to 30.9 mg/kJ）. Each di- et was randomly assigned to triplicate groups of 30 fish. The feeding trial lasled tot 8 weeks. The results showed that the dietary protein level significantly intlueneed the growth, iced eft＇i- eiency （FE） anti proleitn efficiency ratio （PER）（P〈O.O1）. The weight gain and specific gro^fh rates （S（,R） of fish were signifieantly improved with the increasing dietary protein（P〈0.05）, and the peak value occurred in f＇ish [~tt the diets with 40% protein and 10% lipid （29.2 mg/k,I）, which was significantly higher thaH that fed with 30% dietary protein, however, no signii＇ictltlt difl＇erenee was observed between 35% and 40% dietal~ prolein treatments. Similarly. FE wassignificantly etary protein, and the both in fish fed dMs with Ihe fl^creasing di- peak value occurred with 35% protein and 8% lipid （26.5 mg/kJ） and in fish fed diets with 40% protein and 10% lipid. Hover, the highest PEFI was observed in fish fed （li- ets with 35% protein and 8% lipid, which was significantly higher than fish fed diets wilh 40% l）rolein, but no significant difference was foulld c＇ompared with and other groups.