Chicken QTLdb data summary

As of Apr 20, 2026, there have been 30,465 QTL / eQTL / associations released for public access on the Chicken QTLdb. These data were curated from 423 publications and represent 244 base traits, 283 trait variants, and 40 eQTL genes.

Data summary selector:

of trait names by their frequency in QTL/association reports

Trait variants used in experiments

Trait variants	In Experiments
Birth weight	130
Weaning weight	84
Backfat thickness	78
Body weight at 42 days	41
Slaughter weight	40
Chest circumference	39
Body weight at 70 days	35
Body weight at 56 days	32
Yearling weight	32
Litter size	32
Average backfat thickness	32
Body weight at 84 days	29
Body weight at 28 days	27
Chest depth	26
Body weight at 6 months	26
Total number born	25
Withers height	24
Body weight at 35 days	22
Heart girth	20
. . .	. . .

NOTE: On this site, the term "QTL" may have collectively included quantitative loci, SNP associations, and eQTL data.