Effects of Protein Level on Growth, Body Composition and Serum Biochemical Indices of Chinese Ink Carp Procypris merus
XIE Yutong1,2,3,4, CHEN Xiaoying2,3,4, HUANG Wen2,3,4, CAO Junming1,2,3,4, WU Haomin2,3,4, WANG Guoxia2,3,4
1. College of Fisheries, Guangdong Ocean University, Zhanjiang 524088, China; 2. Institute of Animal Science, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China; 3. Guangdong Key Laboratory of Animal Breeding and Nutrition, Guangzhou 510640, China; 4. Key Laboratory of Animal Nutrition and Feed Science in South China, Ministry of Agriculture and Rural Affairs, Guangzhou 510640, China
Abstract：A 62-day feeding trial was conducted to investigate the effects of different protein levels on growth performance, body composition and serum biochemical indices of juvenile Chinese ink carp Procypris merus, and to explore the optimal protein requirements. Juvenile Chinese ink carp with an initial body weight of (4.41±0.01) g were reared in a circulating water glass tank (150 L) and fed five kinds of iso-lipid and iso-energy diets containing 25%, 30%, 35%, 40% and 45% protein by adjusted by casein levels to investigate the effects of different crude protein levels on the growth performance, body composition and serum biochemical indices and optimum crude protein requirement of the juveniles at water temperature of 25.5—31.5 ℃. The results showed that weight gain rate and specific growth rate continued to increase with dietary crude protein level increasing (P<0.05), significantly higher in 45% group than those in 25%, 30% and 35% groups. The ingestion rate, feed conversion ratio was shown to be decreased (P<0.05), significantly lower in 40% group than that in 25%, 30% and 35% groups, without significant differences in condition factor and hepatosomatic indices among all groups (P>0.05). The crude lipid content of whole body was inversely proportional to dietary crude protein level, significantly higher in 25% and 30% groups than that in the other groups, without significant changes in crude protein, moisture and ash contents of fish body among all groups (P>0.05). With the dietary protein level increasing, serum cholesterol, and triglyceride contents, and activities of alanine aminotransferase and aspartate aminotransferase were firstly increased and then decreased (P<0.05), significantly lower in 45% group than those in 30% group. The contents of high-density lipoprotein cholesterol and high-density/low-density lipoprotein cholesterol were found to be firstly decreased and then increased (P<0.05), significantly higher in 45% group than those in 30% group, without significant differences in blood glucose and low density lipoprotein cholesterol among all groups (P>0.05). In conclusion, juvenile Chinese ink carp has good growth performance in 40% and 45% groups, without significant difference between the two groups, and the optimal dietary crude protein level is 40% for juvenile Chinese ink carp under the experimental conditions, combined with economic benefits.
谢雨桐, 陈晓瑛, 黄文, 曹俊明, 吴浩敏, 王国霞. 蛋白水平对禾花鲤生长、体组成和血清指标的影响[J]. 水产科学, 2023, 42(5): 847-853.
XIE Yutong, CHEN Xiaoying, HUANG Wen, CAO Junming, WU Haomin, WANG Guoxia. Effects of Protein Level on Growth, Body Composition and Serum Biochemical Indices of Chinese Ink Carp Procypris merus. 水产科学, 2023, 42(5): 847-853.
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2023, Vol. 42 
