AQUACULTURE NUTRITION

Effects of Partial Replacing Monocalcium Phosphate with Neutral Phytase on Growth Performance, Body Composition and Phosphorus Utilization of Carassius auratus gibelio

  • ZENG Xiaoai ,
  • XU Shude ,
  • CHEN Qinghua ,
  • XUAN Yanjun ,
  • ZHAO Qinghai
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  • 1. College of Animal Science and Technology, Hunan Agricultural University, Changsha 410128, China;
    2. Guangdong VTR Co., Ltd., Zhuhai 519060, China

Received date: 2015-12-17

  Online published: 2016-06-27

Abstract

An 8-week feeding trial was conducted to study the effects of partial replacing monocalcium phosphate (MCP) with neutral phytase on growth performance, body composition, serum biochemical parameters and phosphorus utilization of Carassius auratus gibelio. Seven groups were designed in this experiment, there were D1 (the positive control group, 1.5% MCP), D2 (the negative control group 1, 1.0% MCP), D3 (1.0% MCP+400 U/kg neutral phytase), D4 (1.0% MCP+800 U/kg neutral phytase), D5 (the negative control group 2, 0.5% MCP), D6 (0.5% MCP+400 U/kg neutral phytase) and D7 groups (0.5% MCP+800 U/kg neutral phytase). Each group had 3 replicates and each replicate had 25 fish with the initial average body weight of (23.39±0.10) g. The results showed as follows: after the 8-week feeding trial, the D5 group showed the worst growth performance, and the weight gain rate, specific growth rate and feed intake in D5 group were significantly lower than those in the D1 group (P<0.05), while the feed conversion ratio was significantly higher than those in the other groups (P<0.05). The weight gain rate and specific growth rate in D2 and D6 groups were significantly lower than those in D1 group (P<0.05), while the feed conversion ratio was significantly higher than that in the D1 group (P<0.05). All growth performance indices in D3, D4 and D7 groups had no significant differences compared with D1 group (P>0.05). The moisture, crude protein, ash and phosphorus contents of whole body, and serum cholesterol content and alkaline phosphatase activity had no significant differences among the all groups (P>0.05). Serum phosphorus and triglyceride contents, in addition to the D5 group, showed no significant difference between the rest groups (P>0.05). At the same supplemental level of MCP, the phosphorus retention ratio and apparent digestibility in neutral phytase supplementation groups were significantly higher than those in no neutral phytase supplementation groups (P<0.05), while the phosphorus discharge was opposite (P<0.05). The present study suggests that when the diet is supplemented 400 and 800 U/kg of phytase, the MCP level can be reduced by 0.5% and 1.0%, respectively, without affecting the growth performance, body composition and serum biochemical parameters of Carassius auratus gibelio. Neutral phytase partial replacing MCP in Carassius auratus gibelio diet can improve the utilization of phosphorus and reduce the phosphorus discharge, thus brings economical and ecological benefits.

Cite this article

ZENG Xiaoai , XU Shude , CHEN Qinghua , XUAN Yanjun , ZHAO Qinghai . Effects of Partial Replacing Monocalcium Phosphate with Neutral Phytase on Growth Performance, Body Composition and Phosphorus Utilization of Carassius auratus gibelio[J]. Chinese Journal of Animal Nutrition, 2016 , 28(6) : 1710 -1719 . DOI: 10.3969/j.issn.1006-267x.2016.06.011

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