Effects of soybean meal processing treatments on growth performance, nutrient digestibility, nitrogen and phosphorus excretion in red swamp crayfish, Procambarus clarkii
2017
Wan, Jin-juan | Shen, Mei-fang | Tang, Jian-qing | Lin, Hai | Yan, Wei-hui | Li, Jia-jia | Zhu, Lin
In this study, growth performance, apparent digestibility coefficients, phosphorus and nitrogen excretion were determined in red swamp crayfish (Procambarus clarkii) (5.39 ± 0.12 g) for four soybean products: soybean meal (SBM), soybean meal diets supplemented with 1000 IU/kg phytase (SBM + P), extruded soybean meal (ESBM) and fermented soybean meal (FSBM). The results showed that compared with the SBM diet, the crayfish fed the SBM + P and FSBM diets showed significantly higher specific growth rate (SGR) and lower feed conversion ratio (FCR) (P < 0.05). The highest and lowest dry matter (DM) digestibilities were observed in SBM + P and ESBM diets, respectively (P < 0.05). Differences in crude protein (CP) and gross energy (GE) followed differences in DM digestibility. SBM + P had the highest phosphorus digestibility, and ESBM had the lowest. The highest crude lipid (CL) digestibility coefficient was observed in FSBM, followed by SBM + P, and the lowest in ESBM (P < 0.05), which was similar to SBM. And the ESBM group had the highest phosphorus content in sediments (P < 0.05); while the highest nitrogen content was observed in SBM group, which was significantly higher than SBM + P group (P < 0.05). The water phosphorus contents in SBM and ESBM groups were significant higher than SBM + P group at 48 h (P < 0.05), but there were no significant differences among the water nitrogen content of all groups (P > 0.05).
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