【摘要】 以初始体质量(5.50±1.63)g的鲈鱼为研究对象,探讨饲料中添加不同含量的无机盐预混料对鲈鱼生长、鱼体成分及鱼体和脊椎骨钙和磷含量的影响。基础饲料中分别加入0%、1%、2%和4%的无机盐预混料制成4种等氮等能(蛋白质42%,总能20 kJ/g)的试验饲料,进行10周的摄食生长试验。试验结果表明,饲料中添加不同含量的无机盐预混料对鲈鱼的成活率无显著影响。随着饲料中无机盐预混料含量的升高,鲈鱼的饲料效率和特定生长率均呈上升趋势,并且当饲料中添加4%无机盐预混料时,鲈鱼的饲料效率和特定生长率均显著高于添加量为0%、1%和2%组(P<0.05)。饲料中添加不同含量的无机盐预混料对鲈鱼鱼体的水分含量无显著影响,但饲料中添加2%和4%的无机盐预混料时,鲈鱼鱼体的蛋白质和灰分含量均显著高于0%和1%添加量组(P<0.05),而脂肪含量显著低于0%和1%添加量组(P<0.05)。鱼体中钙和磷的变化趋势与鱼体灰分的变化趋势一致,均随着饲料中无机盐预混料含量的升高呈现明显的上升趋势,当饲料中添加4%无机盐预混料时鱼体钙和磷的含量显著高于添加量为0%组(P<0.05)。鱼体脊椎骨钙和磷的变化趋势与脊椎骨灰分的变化趋势一致,均随着饲料中无机盐预混料含量的升高呈现明显的下降趋势,并且当饲料中添加4%无机盐预混料时脊椎骨钙和磷的含量显著低于添加量为0%组(P<0.05)。在本试验条件下,鲈鱼配合饲料中无机盐预混料的推荐添加量为4%。更多还原

【Abstract】 A feeding experiment was conducted to evaluate the need for dietary mineral premix supplementation in Japanese seabass Lateolabrax japonicus.Four isonitrogenous and isoenergetic(42% crude protein,20 kJ/g gross energy) diets,containing 0%,1%,2% and 4% mineral premix were formulated.Triplicate groups of 20 fish [initial body weight(5.50±1.63) g] were fed the diets to satiation by hand twice daily for 10 weeks in sea floating cages(1.5 m×1.5 m×2.0 m).The results showed that survival rates were not significantly influenced by different levels of dietary mineral premix.Feed efficiency(FE) and specific growth rate(SGR) tended to increase with the increasing level of dietary mineral premix,and when the mineral premix level was 4%,the FE and SGR were significantly higher than those in 0%,1% and 2% groups(P<0.05).Carcass moisture was not significantly affected by dietary mineral premix levels,but when the mineral premix was 2% and 4%,the carcass protein and ash content were significantly higher than that in 0% and 1% groups(P<0.05),while lipid was significantly lower than in the 0% and 1% group(P<0.05).Analysis of Ca and P contents of fish carcass indicated that Ca and P contents were in consistent with that of carcass ash,they all positively correlated with dietary mineral premix levels,and when the mineral premix was 4%,the carcass Ca and P contents were both significantly higher than that in 0% group(P<0.05).The Ca and P contents of vertebra showed that they were both in consistent with vertebra ash,and negatively correlated with the dietary mineral premix levels.When the mineral premix level was 4%,Ca and P contents were significantly lower than that in 0% groups(P<0.05).The present results indicated that the optimal additional level of mineral premix in Japanese seabass feed was 4%.更多还原