In this study, a 60‐day feeding trial was conducted to determine the effects of feed supplementating the feed of Apostichopus japonicus with peptides on its growth, energy budget, body composition and immune responses. Sea cucumbers were fed with five experimental diets supplemented with different proportions of peptides: 0 (D1), 12.5 (D2), 25 (D3), 37.5 (D4) and 50 (D5) g/kg in basal diet. Our results suggested that specific growth rate (SGR) and ratio of viscera to body wall (RVBW) of sea cucumbers fed with D4 were significantly improved. Relative to D1, ingestion rate (IR) and faeces production rate (FPR) for D3 and D4 were reduced considerably. Notably, the energy intake increased when peptide level increased from 0 to 50 g/kg. Meanwhile, the energy deposited for growth increased, and the energy loss decreased when peptide level increased from 0 to 37.5 g/kg. The sea cucumbers in D4 had the highest level of crude fat and lowest crude ash. The activities of immunoenzyme, such as SOD, CAT, T‐AOC, ACP and AKP, increased with peptide increase. Results suggested that supplementation of the feed with 25–37.5 g/kg peptides could significantly improve the growth performance, body composition and immune capacity of Apostichopus japonicus.

中文翻译：

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膳食多肽摄入量对刺参生长，能量平衡，身体组成和非特异性免疫的影响

在这项研究中，进行了60天的喂养试验，以确定补充日本刺参饲料的饲料的效果在生长，能量收支，身体组成和免疫反应方面具有多肽。向海参喂食五种补充不同比例的肽的实验饮食：基础饮食中的0（D1），12.5（D2），25（D3），37.5（D4）和50（D5）g / kg。我们的结果表明，饲喂D4的海参的比生长速率（SGR）和内脏与体壁的比率（RVBW）显着提高。相对于D1，D3和D4的摄入率（IR）和粪便生产率（FPR）大大降低了。值得注意的是，当肽水平从0增至50 g / kg时，能量摄入增加。同时，当肽水平从0增加到37.5 g / kg时，沉积的生长能量增加，能量损失减少。D4中的海参具有最高水平的粗脂肪和最低的粗灰分。免疫酶的活性 如SOD，CAT，T-AOC，ACP和AKP随着肽的增加而增加。结果表明，在饲料中添加25–37.5 g / kg肽可以显着改善仔猪的生长性能，身体组成和免疫能力刺参。