两种鱼粉水平对9个斑节对虾家系生长性能及饲料利用的影响

Effects of two dietary fish meal levels on growth performance and feed utilization of 9 Penaeus monodon families

研究了鱼粉水平分别为30%和20%的饲料对9个斑节对虾(Penaeus monodon)家系生长性能及饲料利用的影响,结果表明,9个斑节对虾家系在两种鱼粉水平饲料下的特定生长率、存活率、饲料系数及饲料干物质表观消化率差异均不显著(P>0.05)。20%鱼粉水平饲料组中,1号、3号、5号、9号家系的存活率分别为(58.89±4.84)%、(55.56±10.94)%、(73.34±8.82)%、(64.44±5.88)%,显著高于其余家系(P<0.05)。双因素方差分析结果显示,饲料鱼粉水平与斑节对虾家系不存在显著性交互作用(P>0.05),说明斑节对虾家系的生长性能及对饲料的利用率与饲料鱼粉水平无关,而与斑节对虾遗传因素相关,在饲料蛋白水平高时,生长速度的差异缩小;在饲料蛋白水平较低时,生长遗传效应的显著差异便清楚地显现出来。研究结果可为通过家系选育筛选出适应低鱼粉水平饲料的优良品系提供理论依据及数据参考。

Effects of dietary fish meal levels(30%,20%)on growth performance and feed utilization of Penaeus monodon from 9 families were conducted under laboratory conditions.Results showed that there was no significant difference in specific growth rate(SGR),survival rate(SR),feed conversion ratio(FCR)and apparent feed dry matter digestibility between 9 Penaeus monodon families fed with two dietary fish meal levels.Survival rates of families No.1,No.3,No.5 and No.9 in 20%fish meal level diet group were(58.89±4.84)%,(55.56±10.94)%,(73.34±8.82)%,(64.44±5.88)%,respectively,which were significantly higher than those of other families.Two-way ANOVA analysis showed that there was no significant interaction between dietary fish meal levels and P.monodon famiies.The growth performance and feed utilization of P.monodon families were not related to dietary fish meal levels,but to genetic factors of P.monodon,when the diet protein level was high,the phenotypic difference reduced,and when the diet protein level was low,the significant difference of the genetic effect of growth was obvious.The results provide a theoretical basis and data reference for screening fine strains adapted to low dietary fish meal level through family breeding.