Study Links Host Genetics and Cecal Microbiota to Muscle Growth in Meat Rabbits
Researchers integrated genomic, transcriptomic, and microbiome data from 321 meat rabbits to identify host genetic and microbial factors associated with loin muscle weight, a key indicator of carcass yield. The study found moderate genetic heritability for loin muscle weight and identified specific cecal microbial genera, particularly Methanosphaera, as negatively associated with the trait. The findings suggest potential targets for selective breeding and microbiome-informed nutritional strategies to improve meat production efficiency.
A study published on bioRxiv analyzed whole-genome resequencing, cecal transcriptome profiles, and gut microbiome data from 321 Kangda meat rabbits to understand what drives variation in loin muscle weight. Loin muscle weight showed moderate SNP-based heritability (h² = 0.39), while the cecal microbiome explained a smaller but detectable share of phenotypic variation (m² = 0.13). Multi-strategy microbial screening identified 19 candidate cecal genera linked to loin muscle weight, with Methanosphaera showing the strongest negative association. Genome-wide association analyses prioritized candidate loci near genes MEX3C and TCF4 on chromosome 10, and integration of expression quantitative trait loci data further highlighted GJB3 as a candidate gene. The cecum was found to harbor greater microbial diversity than the rectum, and host genetic relatedness correlated weakly but significantly with cecal — but not rectal — microbial similarity, underscoring the cecum's central role in hindgut fermentation and muscle trait regulation. The authors propose these candidate genes and microbial taxa as targets for functional validation and practical breeding or nutritional interventions.
What's missing
As a preprint, this study has not yet undergone peer review, so findings should be treated as preliminary. The study is observational and correlational; no causal mechanisms between the identified microbial taxa or genetic loci and loin muscle deposition have been experimentally validated. The research is limited to a single breed (Kangda meat rabbits), which may restrict generalizability to other rabbit breeds or livestock species.
What different sources said
- bioRxivCenter
Host genetic regulation of fermentation-related cecal microbial taxa is associated with loin muscle deposition in meat rabbits
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