膨化饲料动植物蛋白比对中华鳖稚鳖生长特性的影响
EFFECTS OF ANIMAL-PLANT PROTEIN RATIO IN EXTRUDED AND EXPANDED FEED ON THE GROWTH PERFORMANCE OF JUVENILE CHINESE SOFT-SHELLED TURTLE (PELODISCUS SINENSIS WIEGMANN )
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摘要: 本实验设计了营养相近、不同动植物蛋白比的四种膨化饲料(饲料1,1.5∶1;饲料2,3∶1;饲料3,5∶1;饲料4,7∶1),研究了动植物蛋白比对中华鳖稚鳖摄食、生长、饲料利用能力和营养组成的影响。饲料1组稚鳖的摄食率显著高于饲料2-4组。饲料1-4组稚鳖的特定生长率没有显著影响。饲料1组稚鳖的干物质和脂类消化率、饲料转化效率、蛋白贮积率和能量贮积率显著低于饲料2-4组。饲料1组稚鳖体脂肪含量显著低于饲料4组。稚鳖的上述指标在饲料2-4组间均无显著差异。结果表明,鳖膨化饲料动植物蛋白比对中华鳖稚鳖生长特性有明显的影响,适宜的动植物蛋白比为3∶1。Abstract: Effects of animal-plant protein ratio in extruded and expanded feed on feeding, growth rate, feed utilization and body composition of juvenile Chinese soft-shelled turtle (Pelodiscus sinensis ) were studied in this experiment. Four extruded and expanded feeds (dietsl-4) were formulated with different animal-plant protein ratios (diet 1,1.50： 1 ; diet 2,2.95: 1 ; diet 3,4.92: 1 and diet 4,7.29：1 ). Feeding rate of juvenile turtle fed diet 1 was significantly higher than those of the groups fed diet 2-4. There was no significant difference in specific growth rate among the groups fed diet 1-4. The apparent digestibility coefficients for dry mass and lipid of juvenile turtle fed diet 1 were both significantly lower than those of the groups fed diet 2-4. Feed conversion efficiency, protein retention efficiency and energy retention efficiency of juvenile turtle fed diet 1 were also significantly lower than those of the group fed diet 2-4. Body lipid content of juvenile turtle fed diet 1 was significantly lower than that of the group fed diet 4. There were no significant differences in the parameters described above among the groups of diet 2-4. Those results indicate that the growth performance of juvenile turtle is affected by the animal-plant protein ratio in extruded and expanded feed, and the optimum animal-plant protein ratio in extruded and expanded diets is around 3: 1.
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