Abstract
Purpose
When blended, animal and plant proteins can complement each other in terms of amino acid composition and release time. In this study, we investigated whether the blended protein diet has a better feeding effect than the single protein diet, and to reveal the differences in growth and intestinal microbiota composition caused by the blended protein diet.
Methods
Forty Sprague Dawley (SD) rats received diets with different protein sources, including casein (C), whey protein (WP), black soybean protein (BSP), and black soybean-whey blended protein (BS-WP), for eight weeks. To investigate the effects of blended protein supplement on gut microbiota and metabolites, we performed a high throughput 16S rDNA sequencing and fecal metabolomics profiling. In addition, we determined growth and serum biochemical indices, and conducted intestinal morphology analyses.
Results
Compared to those in the BSP and WP groups, the daily body weight gain and feed conversion efficiency increased in the BS-WP group. Serum biochemical indices indicated that the protein utilization efficiency of the WP and BS-WP groups was relatively high, and the BS-WP blended protein diet improved the protein adoption rate. The BS-WP blended protein diet also improved intestinal tissue morphology and promoted intestinal villi development compared to the single protein diets. Furthermore, dietary protein altered the composition of gut microbiota, the gut microbial diversity of rats fed with the BS-WP diet was significantly (P < 0.05) higher than that of the other groups. The difference in dietary protein corresponded with an alteration of fecal amino acids and their metabolites, and tryptophan and tyrosine metabolism were the key mechanisms leading to the changes in fecal microbial composition.
Conclusion
Dietary protein sources played an important role in the growth and development of rats by influencing intestinal metabolism and microbial composition. The BS-WP blended protein diet was more conducive to nutrient absorption than the single protein diet. Furthermore, blended protein increased the diversity of intestinal microbes and aided the establishment of intestinal barrier function.
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Data availability statement
The data that support the findings of this study are available upon request from the corresponding author.
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Funding
This work was supported by National Key Research and Development Plan of the Ministry of Science and Technology (2018YFE0206300), Heilongjiang Province Post-doctoral Funded Project (LBH-Z20205), Heilongjiang Provincial Natural Science Foundation of China (LH2020C087), Heilongjiang Bayi Agricultural University Talent Support Program Project (ZRCPY202004), Heilongjiang Bayi Agricultural University Introduced Talent Research Project (XYB201917).
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DZ and KZ designed the work; WM and DL performed the work; XS and DL analyzed the data; KZ wrote the first draft; LW and DZ approvaled of the version to be published.
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Zhuang, K., Meng, W., Shu, X. et al. Fecal metabonomics combined with 16S rDNA sequencing to analyze the changes of gut microbiota in rats fed with different protein source diets. Eur J Nutr 62, 2687–2703 (2023). https://doi.org/10.1007/s00394-023-03168-y
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DOI: https://doi.org/10.1007/s00394-023-03168-y