| 摘要: |
| 【目的】探讨饲料磷含量对黄颡鱼生长和磷代谢的影响。【方法】以磷酸二氢钙为磷源，制备磷含量分别为0.28%，0.46%，0.67%，0.89%，1.13%，1.38%和1.57%的7种精制试验饲料，用其饲养黄颡鱼（体质量（8.75±0.72） g/尾）8周，试验结束后取样，测定生长、饲料利用、钙磷代谢、肌肉营养成分和脊椎骨钙磷沉积等指标。【结果】饲料磷含量为0.67%组的平均增重率和特定生长率与0.46%组差异不显著，但显著高于其他各组（P<0.05）；当饲料磷含量为0.67%和0.89%时，饲料效率和蛋白效率显著高于其他各组（P<0.05）；当饲料磷含量为0.67%时，饲料蛋白质生产率显著高于除0.89%组以外的其他各组（P<0.05）。血清降钙素随着饲料磷含量的升高先升高后降低（P<0.05），在1.13%组时达到最高，显著高于除0.89%和1.38%组外的其他各组（P<0.05）；血清甲状旁腺素含量随饲料磷含量的升高呈先下降后上升的趋势，在1.13%组时降到最低。肌肉粗脂肪含量随饲料磷含量的升高而显著降低，而肌肉粗灰分含量则随饲料磷含量的升高而显著升高，在磷含量为1.13%时，肌肉粗脂肪含量显著低于0.28%，0.46%和0.67%各组（P<0.05）。在磷含量为0.89%时，肌肉粗灰分含量与除0.28%组外的其他各组差异不显著。脊椎骨磷含量随饲料磷含量的升高呈先升高后降低的趋势，当饲料磷含量为1.13%时，脊椎骨磷含量最大，与除0.28%，0.46%和0.89%各组外的其他各组差异不显著。脊椎骨钙含量随饲料磷含量的升高亦呈现先升高后降低的趋势，在饲料磷含量为0.89%时达到最大值，显著高于0.28%组（P<0.05）。脊椎骨钙磷比在0.89%组达到最高，显著高于1.38%和1.57%组（P<0.05）。【结论】在本试验条件下，黄颡鱼最适生长、饲料利用和磷代谢的适宜饲料有效磷含量为0.46%～1.13%。 |
| 关键词: 黄颡鱼 磷代谢 饲料磷含量 |
| DOI： |
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| 基金项目:国家自然科学基金项目（31372540）；吉林省自然科学基金项目（20150101114JC） |
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| Effects of dietary phosphorus on growth and phosphorus metabolism of juvenile yellow catfish (Peltobagrus fulvidraco) |
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CONG Linmei,ZHENG Wei,LIU Fanning,et al
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| Abstract: |
| 【Objective】This study was conducted to investigate the effects of dietary phosphorus on growth and phosphorus metabolism of juvenile yellow catfish (Peltobagrus fulvidraco).【Method】Healthy juvenile yellow catfish (8.75±0.72) g were fed on purified diets with seven dietary phosphorus levels (0.28%,0.46%,0.67%,0.89%,1.13%,1.38%,and 1.57%) for 8 weeks.Growth,feed utilization,calcium and phosphorus metabolism,muscle nutrients and spine deposition of calcium and phosphorus,and other indicators were measured and analyzed.【Result】Average weight gain rate and specific growth rate of 0.67% phosphorus group was not significantly different from those of 0.46% group,but significantly higher than those of other groups (P<0.05).The feed efficiency and protein efficiency of 0.67% and 0.89% groups were significantly higher than those of other groups (P<0.05).Protein productivity rate of 0.67% group was significantly higher than those of other groups (P<0.05) except for 0.89% group.With increasing dietary phosphorus content,serum calcitonin increased first and then declined （P<0.05） with the peak value in 1.13% group,which was significantly higher than other groups except for 0.89% and 1.38% groups.Serum PTH significantly decreased first and then (P<0.05) with the increase of dietary phosphorus content and the lowest value was in 1.13% group.Muscle fat content decreased significantly with increasing phosphorus content,while muscle ash content increase significantly.Group 1.13% had the highest muscle fat content while muscle ash contents were not significantly different among groups.Phosphorus content in spine increased and then decreased with increasing dietary phosphorus content and 1.13% group had the highest value without significant differences from that of other groups except for groups 0.28%,0.46%,and 0.89%.Spine calcium content also increased before decreasing with the increase of dietary phosphorus content with the maximum in 0.89% group,which was significantly higher than that of groups 0.28%,1.38%,and 1.57% （P<0.05）.Ratio of calcium to phosphorus ratio of group 0.89% was the highest and significantly higher than that of groups 1.38% and 1.57% (P<0.05).【Conclusion】Under the experimental conditions,phosphorus content for optimal growth,feed utilization and phosphorus metabolism of Peltobagrus fulvidraco was 0.46%-1.13%. |
| Key words: yellow catfish(Peltobagrus fulvidraco) phosphorus metabolism dietary phosphorus content |
