Effects of dietary supplementation of squid liver meal and soluble fish protein concentrates on growth performance and liver function of Pelodiscus sinensis
Squid liver meal is an attractant used in aquafeed widely. However, the fatty acid rancidification and high content of cadmium in squid liver meal may affect the animal health. Soluble fish protein concentrates are produced from the waste water of fish meal production, and have many attractive mater...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Zhejiang University Press
2014-05-01
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| Series: | 浙江大学学报. 农业与生命科学版 |
| Subjects: | |
| Online Access: | https://www.academax.com/doi/10.3785/j.issn.1008-9209.2013.08.063 |
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| Summary: | Squid liver meal is an attractant used in aquafeed widely. However, the fatty acid rancidification and high content of cadmium in squid liver meal may affect the animal health. Soluble fish protein concentrates are produced from the waste water of fish meal production, and have many attractive materials. Chinese soft-shelled turtle, Pelodiscus sinensis, is an important economic animal in China, and fishmeal is one main protein resource in turtle feed. Squid liver meal and soluble fish protein concentrates maybe the alternatives to fishmeal in turtle feed because of their high protein content and low price. No study has reported the effects of squid liver meal on health of turtle and the utilization of soluble fish protein concentrates in turtle feed. Therefore, this experiment has the aim of exploring the effects of the supplementation of squid liver meal and soluble fish protein concentrates on the growth and liver function of P. sinensis.Three experimental groups were designed, control group (white fishmeal group, WFM), squid liver meal group (SLM) and soluble fish protein concentrates group (SFP). Nutritional compositions of three diets were similar. For the diets of SLM and SFP, 5% white fishmeal in the control diet was replaced with squid liver meal and soluble fish protein concentrates respectively. The feeding experiment lasted for eight weeks. Chinese turtles with initial average body mass of 6.8 g were fed twice a day at (30±1)℃. Feed intake, growth and feed utilization were determined, and the activities of glutamic-oxalacetic transminase (GOT) and glutamic-pyruvic transminase (GPT) for liver and serum and the contents of serum triglyceride and cholesterol were analyzed.No significant difference was found in feeding rate, specific growth rate, viscera-somatic index, hepatosomatic index among three experimental groups. Feed coefficient of SFP was significantly higher than WFM and SLM, and there was no significant difference in feed coefficient between WFM and SLM. Digestibilities of dry mass and lipid of SLM were both significantly higher than those of WFM. No difference in protein digestibility was found between SLM and WFM. Digestibilities of dry mass, protein and lipid of SFP were all significantly higher than those of WFM. Hepatic GOT activity of SLM was significantly lower than that of WFM, and serum GPT activity of SLM was significantly higher than that of WFM. There were no significant differences in GPT and GOT activities between SFP and WFM for both liver and serum tissues. No significant difference was found in the contents of serum triglyceride and cholesterol among three experimental groups.These results indicated that 5% dietary supplementation of squid liver meal may cause slight hepatic damage to turtle, but had no evident effect on growth; and 5% dietary supplementation of soluble fish protein concentrates could reduce feed utilization, but had no adverse effects on liver function of turtle. Since the price of squid liver meal is lower than that of soluble fish protein concentrates, squid liver meal may be more suitable than soluble fish protein concentrates to replace fishmeal in turtle feed, and the recommended supplementation level should be less than 5%. |
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| ISSN: | 1008-9209 2097-5155 |