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Articles by J. NIU
Total Records ( 2 ) for J. NIU
  L. X. Tian , Y. J. Liu , S. S. O. Hung , D. F. Deng , H. J. Yang , J. Niu and G Y. Liang
  Problem statement: Feeding strategy is the important factor in aquaculture. Feeding strategy not only could affect the growth performance of grass carp and feed efficiency, but also could affect the quality and environment of water resource. We have proved that glucose was more suitable than starch as the carbohydrate source for grass carp under the restricted feeding frequency. While different feeding strategies may have resulted in the differences in carbohydrate utilization among fish species. No studies have so far been reported that compare the utilization of carbohydrate source in different feeding strategy of grass carp. Approach: A 9-weeks growth trial was conducted to determine the effect of feeding frequency (2, 6, 12 and 23 meals day-1) and two different carbohydrate source (30% starch versus 30% glucose) on the carbohydrate utilization of grass carp (Ctenopharyngodon idella). Both of the two diets with the same feeding rates but with four different feeding frequencies were fed to triplicate groups of grass carp (mean initial wet weight 35.94±1.86 g). Results: In the glucose diet groups, significantly (p<0.05) higher Final Body Weight (FBW, g), Weight Gain (WG, %), Specific Growth rate (SGR, % day-1), Feed Efficiency (FE, %), Protein Efficiency Ratio (PER), body lipid and serum Triglyceride (serum TG) were observed in the 6, 12 and 23 meals day-1 feeding treatments than that in 2 meals day-1 feeding treatment, all these indexes were not significantly different among the 6, 12 and 23 meals day-1 feeding treatments. While in the starch diet groups, FBW, WG and SGR of fish only in the 6 meals day-1 feeding treatment were significantly (p<0.05) higher than that of fish in the 2 meals day-1 feeding treatment and FBW, WG and SGR of fish in the 12 and 23 meals day-1 feeding treatments provided intermediate results and were not significantly different from the 2 and 6 meals day-1 feeding treatments. When compared the effects between the glucose and starch diet groups in the same feeding frequency, significantly (p<0.05) higher FBW, WG, SGR, FE and PER were observed in the glucose than the starch fed grass carp, only body lipid content was significantly higher in grass carp fed the starch than the glucose diets. Conclusion: It suggested that 6 meals day-1 feeding was sufficient for the optimal growth and feed efficiency for grass carp on 35.1-37.5 g. Furthermore, the growth performance also suggested that glucose was superior to starch as the carbohydrate source for grass carp under the feeding frequency of 6, 12 and 23 meals day-1.
  C.-X. YE , L.-X. TIAN , H.-J. YANG , J.-J. LIANG , J. NIU and Y.-J. LIU
  This study was conducted to investigate the effect of dietary manganese (Mn) on growth, vertebrae and whole-body Mn content of juvenile grouper, and to examine the effect of dietary Mn on copper (Cu), iron (Fe), zinc (Zn), calcium (Ca), phosphorus (P) and magnesium (Mg) content of vertebrae and whole body. Seven casein-gelatin-based diets were supplemented with 0, 5, 10, 15, 20, 50 and 1000mgkg-1 of Mn from MnSO4·H2O. Grouper with an initial weight of 12.9±0.4g were fed to satiation with one of the seven diets for 8weeks. Growth was not significantly affected by dietary Mn supplements. Vertebrae Mn increased from 31.7 to 118.1mgkg-1 dry weight with dietary Mn supplement increasing from 0 to 50mgkg-1 (y= -0.0002x3+ 0.0162x2+1.3903x+ 26.27, R2= 0.9561, where y is the vertebrae Mn content and x is the dietary Mn content). Whole-body Mn increased from 2.5 to 7.8mgkg-1 wet weight with dietary Mn supplement increasing from 0 to 50mgkg-1 (y=0.00001x3- 0.00107x2+0.11054x+ 2.24615, R2=0.9080, where y is the whole-body Mn content and x is the dietary Mn content). Dietary Mn had no significant effect on vertebrae Fe, Ca, P and Mg content, and whole-body Cu, Zn and Mg content. However, vertebrae Zn and whole body Ca, P were highest in fish fed diet supplemented with 15mgkg-1 of Mn. Based on this, Mn supplement of 15mgkg-1 might be the optimum when the basal diet contained 4mgkg-1 of Mn. Fish fed diet supplemented with 1000mgkg-1 of Mn did not show any gross abnormality or change in feeding behaviour, but Mn contents of vertebrae and whole body were as high as 695.1mgkg-1 dry weight and 42.5mgkg-1 wet weight, respectively. Also, whole body Fe decreased significantly when Mn supplement was up to 1000mgkg-1.
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