Physiological and transcriptomic responses to fishmeal-based diet and rapeseed meal-based diet in two strains of gibel carp (Carassius gibelio)
The present study investigated differences in the utilization of fishmeal (FM) and rapeseed meal (RM) by gibel carp (Carassius gibelio) and explored the effects of protein sources on the responses of different genotypes. Gibel carp strains A (4.12 ± 0.03 g) and F (3.47 ± 0.00 g) were fed FM diet or RM diet for 56 days, and after which, growth performance, body composition, hematologic indices, and hepatic transcriptomes were measured. The effects of strain and diet on growth performance, body composition, and hematologic indices were analyzed by two-way analysis of covariance (ANCOVA). The results revealed that total replacement of FM with RM caused poor growth and feed utilization in both strains as well as the existence of genotype-diet interactions. Strain A showed better growth performance than strain F in the FM group, while the strain F grew better than strain A in the RM group. Transcriptomic analysis showed that the three main biological processes affected by the RM diet were amino acid metabolism, lipid metabolism, and digestive system. The different responses to the RM diet between strains were involved in amino acid metabolism, immune responses, and lipid metabolism. Identifying the underlying mechanisms by which different strains differently respond to meal sources might be the basis to develop a selective breeding program towards strains accepting alternative meal sources.
KeywordsFishmeal Rapeseed meal Strain Liver Transcriptome
We thank Mr. Guanghan NIE for his technical support with the rearing system.
This work was financially supported by National Science Foundation of China (31101908), the Strategic Priority Research Program of the Chinese Academy of Sciences (XDA08010405) and the China Agriculture Research System (CARS-45-09).
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