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Effects of Dietary Protein Level on Nitrogen and Energy Budget of Juvenile Chinese Soft-shelled Turtle, Pelodiscus sinensis, Wiegmann

文献类型： 外文期刊

作者： Wang, Jun 1 ; Qi, Zhanhui 1 ; Yang, Zhencai 4 ;

作者机构： 1.Minist Agr, Key Lab Aquat Prod Proc, Guangzhou 510300, Guangdong, Peoples R China

2.Key Lab Fishery Ecol & Environm, Guangzhou 510300, Guangdong, Peoples R China

3.CAFS, South China Sea Fisheries Res Inst, Guangzhou 510300, Guangdong, Peoples R China

4.Hebei Normal Univ, Coll Life Sci, Shijiazhuang 050016, Hebei, Peoples R China

期刊名称：JOURNAL OF THE WORLD AQUACULTURE SOCIETY （ 影响因子：2.512； 五年影响因子：2.47 ）

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收录情况： SCI

摘要： The effects of dietary protein level on nutrient digestibility and utilization of protein and energy of juvenile Chinese soft-shelled turtle, Pelodiscus sinensis, were investigated. Seven isoenergetic diets containing graded levels of protein (25, 27, 29, 31, 33, 35, and 43%) were fed to turtles initially averaging 4.8 +/- 0.7g for 8wk at 30 +/- 0.5C. The apparent digestibilities of dry matter, protein, and energy were generally increased with dietary protein level. Proportions of nitrogen intake (CN) allocated to excretory nitrogen (UN) were higher in 25 and 43% protein diets than the other diets. UN proportion was lowest in the 33% protein diet, whereas retained (growth) nitrogen (RN) followed an inverse pattern with UN. Percentages of gross energy intake (IE) used for excretory energy (UE) generally increased when dietary protein levels increased. Turtles fed 25-29% protein diets showed a markedly higher proportion of metabolizable energy (ME) than those fed 31-43% protein diets. Analysis by second-order polynomial regression using RN as the indicator indicated that the estimated optimal dietary protein level was 34.6%. The lowest and highest percentages of retained (growth) energy (RE) were observed in the 25 and 33% protein groups. Nitrogen and energy budget equations of turtles fed 33% protein diet were 100 CN=8.22 FN+37.48 UN+54.30 RN and 100 IE=10.88 FE+2.82 UE+65.60 ME+20.69 RE, respectively. Diets with excessive protein resulted in high proportions of protein and energy used for excretion.

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