(Aug 25, 2023): A sum of 12,478 new QTL/associations have been curated into the database. (New additions less obsolete/retracted ones: Catfish: 0; Cattle: 1,113; Chicken: 235; Goat: 429; Horse: 0; Pig: 5,972; Sheep: 4,729; Rainbow trout: 0 -- Net increase: 12,478). To date, the current total number of QTL in the database: 278,738 [Breakdown by species -- Cattle: 195,011 (on 680 traits); Chicken: 18,646 (on 372 traits); Goat: 558 (on 26 traits); Horse: 2,649 (on 65 traits); Pig: 54,816 (on 673 traits); Sheep: 4,729 (on 272 traits); Rainbow trout: 2,329 (on 47 traits)].
( This is a joint release with the 19th CorrDB release.)

Database developments notes:
(1) We continued the transition from using "sibling traits" to "trait variants" (see our recent publication "A combinatorial approach implementing new database structures to facilitate practical data curation management of QTL, association, correlation and heritability data on trait variants"; DOI: 10.1093/database/baad024). Since April 2023, 1,597 new trait variants have been created on QTLdb, linked to 3,128 previously curated QTL/association data, and 1,494 new trait variants created on CorrDB, linked to 7,037 previously curated correlation/heritability data. (2) Given the fact that the linkage-map–based QTL/association data being curated into the QTLdb has significantly diminished in the past 6 years (e.g. 2018: 115; 2019: 84; 2020: 1; 2021: 2; 2023: 0), and the fact that all current genome works have already shifted to using sequence maps, we plan to cease the curation of linkage-map–based QTL/association data in 2023, and place all previously curated linkage-map–based QTL/association data in separate downloads/archives by the next database release. Any comments regarding this move are welcome.

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