Exploring Genetic Markers: Mitochondrial DNA and Genomic Screening for Biodiversity and Production Traits in Donkeys.
Authors: Huang Bingjian, Khan Muhammad Zahoor, Chai Wenqiong, Ullah Qudrat, Wang Changfa
Journal: Animals : an open access journal from MDPI
Summary
# Editorial Summary Donkeys represent a critical but underexamined livestock resource in arid and semi-arid regions, yet their genetic improvement lags significantly behind other equine species due to limited breeding programmes and conservation initiatives. Huang *et al.* (2023) conducted a comprehensive review synthesising current knowledge on mitochondrial DNA (mtDNA) sequencing and genomic screening in donkeys, with particular emphasis on the D-loop region—which exhibits high variability and substitution rates suitable for population diversity assessment—alongside nuclear genetic markers including polymorphisms and InDels linked to production and reproduction traits. The authors demonstrate that whilst traditional phenotypic selection (based on milk yield, bodyweight, and height) conflates genetic and environmental influences, genomic marker-assisted selection offers substantially improved precision for identifying animals carrying desirable alleles independent of environmental conditions. Their findings underscore that mtDNA analysis provides robust tools for managing genetic resources within breed conservation programmes, whilst DNA/RNA-level markers enable targeted enhancement of economically important traits in donkey populations. For practitioners involved in donkey breeding, health management, or nutrition planning, these findings suggest that incorporating genetic screening into breeding decisions—particularly where conservation priorities intersect with production goals—could yield meaningful improvements in both population sustainability and individual animal performance across arid regions where donkeys remain economically essential.
Read the full abstract on PubMed
Practical Takeaways
- •Genetic marker screening can improve breeding decisions in donkey operations by identifying animals with desirable production and reproductive traits beyond traditional phenotypic assessment.
- •Mitochondrial DNA analysis, particularly D-loop region sequencing, provides objective data for breed conservation and genetic diversity management in donkey populations.
- •Implementation of genetic screening tools supports selective breeding for enhanced milk production, weight gains, and reproductive performance while maintaining genetic diversity.
Key Findings
- •Mitochondrial D-loop region demonstrates high variability and substitution rates, making it an effective genetic marker for assessing donkey genetic diversity.
- •Genetic markers at RNA/DNA level including polymorphisms and InDels enable selection for improved production and reproductive traits in donkeys.
- •Genetic marker-assisted selection overcomes limitations of phenotypic selection alone by identifying desired traits independent of environmental influences.
- •Establishing breed conservation programs with genetic diversity management is essential for preserving donkey genetic resources within countries.