Quantitative genetic analysis of respiratory function and related traits in Bulldogs, French Bulldogs and Pugs.
Level 5 - mechanism / opinion, no new human data
Veterinary quantitative genetic pedigree study in dogs (animal research)
PubMed 42127146 · doi:10.1371/journal.pone.0348023
What was done
Investigators evaluated Respiratory Function Grading Scheme (RFGS) records alongside pedigree data from over 4,000 UK Kennel Club-registered Bulldogs, French Bulldogs, and Pugs. The RFGS evaluates respiratory function using a standardized exercise test. The authors estimated the heritability of RFGS grades and nostril stenosis, evaluated genetic correlations between traits, and assessed overall screening participation across the breeds.
What was found
The heritability of RFGS grade ranged from 0.21 to 0.49 across the three breeds, while heritability of nostril stenosis ranged from 0.31 to 0.39. Significant genetic correlations were found between RFGS grade and nostril stenosis. Specific numerical correlation coefficients, breed-specific breakdown values, and participation rates were not provided in the abstract.
Why it matters
These findings show that respiratory dysfunction and nostril stenosis have substantial genetic components within extreme brachycephalic breeds, supporting the viability of pedigree-based selective breeding programs to reduce the prevalence of Brachycephalic Obstructive Airway Syndrome.
Limits
This study is restricted to registered pedigree dogs in the UK presenting for voluntary RFGS screening, introducing potential participation and ascertainment biases. Precise breed-specific sample sizes, standard errors, confidence intervals, and correlation metrics are omitted in the abstract.