Keywords

Litopenaeus Vannamei, Salinity, Animal And Plant Protein Ratio, Feed

Abstract

The experiment studied the effects of preparing 6 feeds with different animal and plant protein ratios using fishmeal and soybean protein concentrate as protein sources at different salinities (3 and 22) on the growth, survival and soluble protein content of the hepatopancreas of Litopenaeus vannamei. The feeding trial lasted 40 days. The results showed: (1) The ratio of animal and plant protein in feed can significantly affect the weight gain rate, survival rate, liver body index, fatness and soluble protein content in the hepatopancreas of Litopenaeus vannamei. The weight gain rate increases with the increase in the animal and plant protein ratio of the feed. However, when the animal and plant protein ratio in the feed rises to 29:8, the weight gain rate no longer increases significantly, and other indicators first increase with the feed animal and plant protein ratio. Up to a certain level, and then decreased slightly; (2) The weight gain rate, survival rate and plumpness of the shrimp in the salinity group 22 were significantly higher than those in the salinity group 3, but the liver and body index was significantly lower than those in the salinity group 3. , different salinities have no significant effect on the soluble protein content of the hepatopancreas of Litopenaeus vannamei; (3) Two-factor variance analysis results show that salinity and feed animal and plant protein ratio have no significant effect on the weight gain rate, survival rate and survival rate of Litopenaeus vannamei. There is a significant interaction between the liver and body index, and the maximum values appear respectively in the whole animal protein feed group under salinity 22, the feed group under salinity 22 where whole animal protein and animal and plant protein are 29:8, and the feed group under salinity 3 with animal and plant protein. In the feed group with a ratio of 14:23; (4) broken-line analysis shows that the optimal feed protein ratio for Litopenaeus vannamei at 3¡ë salinity is 29.12:7.79~30.29:6.71, and at a salinity of 22 it is 26.05:10.95~ 29.03:7.44. The results suggest that the composition and content of amino acids in the feed will change with the ratio of animal and plant proteins in the formula, and that Litopenaeus vannamei has different requirements for the animal and plant protein ratio in the feed under different salinities. However, the appropriate animal and plant protein ratio in the feed The plant protein ratio can meet the shrimp’s appropriate needs for various amino acids. Therefore, during the breeding process, it is necessary to design appropriate and practical feed formulas based on the actual breeding environment and types of feed protein sources, so as to achieve the purpose of reducing production costs and improving economic benefits.

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Original research done by Li Erchao, Zeng Si, Yu Na, Xiong Zequan, Chen Xuefen, Liu Lihe, Chen Liqiao

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