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Effects of Different Protein and Lipid Level Diets on Growth, Body Composition and Immunity of Juvenile Phoxinus lagowskii

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  • Freshwater Fisheries Research Academy of Liaoning Province, Liaoning Key Laboratory for Prevention and Treatment of Aquatic Animal Diseases, Liaoyang 111000, China

Received date: 2015-09-09

  Online published: 2016-03-14

Abstract

To evaluate the effects of different protein and lipid level diets on growth, body composition and immunity of juvenile Phoxinus lagowskii, twelve practical diets were formulated to contain 23%, 28%, 33%, 38% of protein supplied with fish meal and soybean meal, and 5%, 8%, 11% of lipid supplied with soybean oil, respectively. Each diet was fed to 3 net cages for 60 d, and each net cage had 30 juvenile Phoxinus lagowskii with an initial average body weight of (27.60±0.13) g. The results showed that protein level significantly affected weight gain rate (WGR), special growth rate (SGR), protein efficiency ratio (PER) and feed conversion rate (FCR)(P<0.05), and lipid level significantly affected PER and FCR (P<0.05). No significant interactions between dietary protein and lipid levels existed for growth performance indices (P>0.05). The WGR and SGR of fish in 23% and 28% protein groups were significantly higher than those in 33% and 38% groups (P<0.05); whereas, the FCR of fish in 8% lipid group was significantly lower than that in 11% lipid group (P<0.05), but there was no significant difference between 8% and 5% lipid groups (P>0.05). With the increase of protein level, the crude protein, crude lipid and ash contents of whole body were firstly increased and then depressed, and the highest values of them were found when protein level was 28%. While moisture content of whole body was not significantly affected by dietary protein level (P>0.05). With the increase of lipid level, the crude lipid content of whole body showed an increasing trend, but no significant difference was found between 8% and 11% lipid groups (P>0.05). The survival rate in low and middle protein groups (23% and 28% protein groups) was higher than that in high protein groups (33% and 38% protein groups) at 48 h after injecting Aeromonas hydrophila (P<0.05). The survival rate in low lipid group (5% lipid group) was higher than that in other 2 groups (8% and 11% lipid groups) at 48 h after injecting Aeromonas hydrophila. In conclusion, the overall results in this study suggest that diet containing 23% to 28% protein and 5% to 8% lipid with a protein to energy ratio of 23.67 to 26.03 mg/kJ is suitable for juvenile Phoxinus lagowskii.

Cite this article

JIANG Xianghui, LUO Xiaonian, JIN Guanghai, LI Jingwei, LIU Yixin, YANG Peimin, ZHANG Jian . Effects of Different Protein and Lipid Level Diets on Growth, Body Composition and Immunity of Juvenile Phoxinus lagowskii[J]. Chinese Journal of Animal Nutrition, 2016 , 28(3) : 864 -871 . DOI: 10.3969/j.issn.1006-267x.2016.03.028

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